Odd is, above all, a very special character, remarkably casual, bringing to the series his own bits of craziness. He clearly shows his complete nonchalance thanks to his look, which is a reflection of his personality. Always dressed in rose or purple, his blond hair always tinted in the front with a blaze of color and combed to a point (thanks to a ton of gel to hold it in place), and his individualistic clothes clearly indicate the cheery and mischievous person who resides within.
Always in good humor whatever the circumstances, always in search of a new bit to play for his audience, or a good joke to use, combined with his small stature (somewhat relieved by his hairstyle) only makes him more remarkable. Of a nature not always very sensitive, he can sometimes become abrasive and hurtful to others, especially in the case of his enemy Sissi who is often the target of his jokes, and thereby his barbs. Very eccentric, he always surprises his friends with his novel attitudes and his sensitive side, which often astonishes them, but sometimes unnerves them too.
Odd didn't always have spiked up hair. In X.A.N.A Awakens, before his adventures in Lyoko, he is introduced with his hair as flat and short.
Aged 13, and in the same eigth grade class with his friends, he does not particularly shine with any extreme maturity, often behaving childishly. Life does not seem to him any more than a simple game, which also explains his scholastic difficulties. Producing always the appropriate behavior, whether in everyday life or in class, is difficult for him to do, especially while amusing himself at the same time. Happily for him, he can count on his friends to keep him on a level course.
Education
The only school classes that he bothers to pay attention to are the artistic subjects, in which he particularly excels. Having himself been born into a family of world-renowned artists, it is only natural that he would have inherited from his parents the curiosity and awareness that for him are so characteristic, aided also by his parent-child relationships which were excellent in every way.
Odd is a little interested in everything, such as fashion, painting, and certain sports activities like juggling and even acrobatics (which serve as training for his expeditions on Lyoko). He seems to have a special interest in music, which shows up in a number of episodes. Without categorizing, he likes nearly all genres, but prefers rock music, which he considers a veritable cult and performs with the others on bass and guitar.
Relationships
Socially, one can say that he gets along well with everybody, his happy personality allowing him to gain a lot of esteem and affection. His "trendy" look particularly inspires the admiration of little Milly and Tamiya, who consider him somewhat like a handy big brother to whom they can come for advice. Meanwhile, despite his personality, he seems intimidated by girls, and Naomi (in "Seeing is Believing ") and Samantha (in "Rock Bottom?") are practically the only ones in whom he seems to be strongly romantically interested.
As another characteristic, Odd is the joyful owner of Kiwi, a small dog of undetermined breed, and of strange appearance. Kiwi is not extremely bright—a slow wit made to take risks for his master who even smuggles him into the airport where animals are forbidden. Nevertheless, he becomes of great use to the group, sometimes even saving their lives, as in the episode "Satellite".
Although their friendship started off rocky, after the events stated in X.A.N.A. Awakens, Ulrich Stern has become Odd's best friend. They share a room at Kadic and they bicker more or so like brothers. Ulrich puts up with alot of Odd's short comings, that the others admit that they would never willilngly go through, such as Kiwi destroying the room, sheding hair on his bed, barking, urinating on his sheet, or Odd's foul foot odor.
Of all the girls that Odd has been with (having it stated that he has date every girl in his class (excluding Sissi, who he can't stand, and Aelita, who is not only masquerading as his cousin, but is also too close of a friend) Samantha Knight has been the one that stayed in his heart, even through to Code Lyoko Evolution, where she has come back to Kadic, and Odd chases after her. In the episode Count-down, when Ulrich brings up the fact that Sam has returned to Kadic, he is psyched. He becomes really upset about messing things up with her, as for after having called her a "beet-root" (or simply a "beet", the exact transletion isnt for sure), because of X.A.N.A. having attacked him for code. He goes to great lengths to get her to be with him, even going as far as to buy her a thousand red roses, in Friday the 13th.
Odd and Yumi usually get along well, but Yumi is easily annoyed and even angered by some of Odds jokes and pranks. Odd is always the one who tries to make Ulrich and Yumi closer, though it usually fails and he ends up being in trouble with one of them.
Odd and Jeremie have some complications to get along because of their differences. Jeremie doesnt understand Odds humor, always telling him that his jokes are bad. In turn, Odd doesnt understand Jeremie when he explains scientific subjects. Odd usually tries to copy homeworks from him and sometimes Jeremie is even ready to help Odd study to the tests. Despite their differences they are good friends as anyone in the team.
Odd and Aelita have somewhat really good relationship. Whenever Aelita is in trouble in Lyoko, Odd heads to her immediatly and is even ready to sacrifice himself for her. Aelita and Odd had a fight only once, because Odd was too sleepy and needed Aelita to tell an excuse for Jim, which resulted them both getting detention.
Odd and William always got along well. They even made team work in Bad Turn and The Secret. When joining to Lyoko Warriors, Odd showed some trust on him and though it was stupid that Yumi voted against him in The Secret. When William was possessed by X.A.N.A, Odd was only one not to take it too seriously and he even taunted William jokefully in Lyoko. When X.A.N.A. returned, Odd was more serious about William rejoining the team, saying that William was "captured like an novice". After he was accidently locked into utility room by Jim and asked William to find him to open the door, William went to Factory instead and Odd got really angry on him. After William rejoined the team and saved Ulrich from falling into Digital Sea, Odd and William started getting along well again, though William takes their job at Lyoko so seriously that he might even offend Odd.
When he is transferred to Lyoko, Odd is virtualized in a form similar enough to his real appearance, except for the addition of claws and a tail, making him resemble rather a "cat-man". In this environment, he displays an extreme agility which permits him easily to sidestep attacks and making him a serious adversary for the minions of X.A.N.A.
Also, he is capable of projecting a dozen arrows from his gauntlet at the arch of his hand, making him particularly dangerous to his adversaries, but only until his supply of projectiles is exhausted, in which case he becomes very vulnerable and has no choice but in avoidance or flight. His fighting tactics are not highly developed, but instinctive. Following a logic all his own, it is not unusual for him to be the first to fall into the traps arranged by X.A.N.A, much to the consternation of Yumi, who has to go to a lot of trouble to extract him.
Odd particularly excels when acting to create a diversion (the well-known "peekaboo, here I am!"), to attract the attention of the monsters and permit his friends to slip by. Nevertheless, this risky tactic has its limits and Odd, despite his agility and trickiness, is often the first to be devirtualized. His friends distrust the crazy ideas that he comes up with, often doing the complete opposite of what he proposes, despite his instinctive character. Concerning powers that he might have, he seems sensitive to the "thoughts" of the super-computer, which allows him to anticipate what is about to happen in excellent "flashes of intuition" that occur to him at the right moment, helping his friends out of inextricable situations.
In Code Lyoko Evolution, Odd has been given a slighty new outfit: the cat ears on top of his head have been removed, and so has Kiwi on his outfit. The original purple stripes on his arms have become yellow ones. Also, Odd gains a new-and-improved Laser Arrow launcher that enables him to fire three or six arrows at once at high speeds.
Like Ulrich and Yumi, Odd gains the ability to deactivate towers as long as he has X.A.N.A.'s source codes within him. In the second episode, he holds a grudge against William after he got locked up into an utility room and William didnt help him. He is much warmer and friendlier towards him after he is allowed to rejoin the team.
Trivia
A lot of people believe that, despite the fact that Odd's parents are artists, Odd's father is a combat general in the French army or perhaps former. This can be hinted at when he says "About face" in several episodes, but this is most evident in the episode Marabounta, when he takes command of XANA's monsters in the destruction of the Marabounta.
Coincidentally, Odd's voice actor, Matthew Geczy, is from just such a family of military men and artists - he is the son of a retired US Army Colonel, George Geczy II. Matt's brother, George Geczy III, is a Lieutenant Colonel who recently served with distinction as a battalion commander in the war in Iraq. Odd in the real life.
Their mother and George II's wife, Evangeline Geczy, is an abstract painter, like Odd's mother.
In A Fine Mess, it is discovered that Odd has something "gross" inside of his shoes. Ulrich mentions that it's "more powerful than a Laser Arrow", and Yumi discovers this first hand in the same episode when she temporarily lives in Odd's body; Odd's feet stink.
Thankfully, Yolanda gave him a creme to help, but it smells just as bad or worse than as his feet.
He is the creator and singer of the song Break Break Break Dance.
In XANA's Kiss, Odd claimed to have dated every girl in the eighth grade except Aelita and Sissi. He has (surprisingly or perhaps not-so) made more attempts at the latter, however, resulting in more jealousy from Herb.
Odd's favorite monsters are Bloks, as quoted by him in The Girl of the Dreams, and he has no trouble destroying them. His least favorite monsters are Creepers which he also mocks all the time while visiting sector 5.
In XANA Awakens, it is revealed that Odd wore his hair down at first, but he started to wear his hair in its current style after going to Lyoko for the first time. (He called it the "Lyoko style".)
Odd's mobile is a silver, telephone style cellphone.
In Dog Day Afternoon (after Odd had fused himself with Kiwi), Odd claimed he was growing a tail.
Odd started the nickname of Einstein, which he typically calls Jeremie, as the other group members have on occasion.
Where nicknames are concerned, it is almost always Odd that comes up with the names for the monsters.
The Transporter that takes the group to Sector 5 gives Odd travel sickness. He states this specifically in A Fine Mess, expressing relief at not being in his own body, whereas Yumi in Odd's body felt like throwing up.
In XANA AwakensOdd finds it unfair that he's the only one that "looks like a nitwit" on Lyoko, although it no longer seems to bother him.
In Cousins Once Removed, it is revealed that Odd styles his outfits (or possibly only his second outfit) based on the game "Kung-Fu Commando". Though, solely on the first 7 levels; according to Patrick, the outfits get more tame at level 8.
Odd is one of the most talented acrobats besides Yumi when it comes to fighting, both on Lyoko and in the real world.
Odd's Lyoko outfit has a design on its chest that seems to resemble his dog Kiwi. In Season 4, another design of Kiwi appears on his shoulder plate. However, when he is in the real world shutting down supercomputers that house X.A.N.A.'s replicas, the design that is on his chest is gone but the one on his shoulder is still there.
Odd is the first character to kiss a girl.
It is revealed in season one that Odd knows how to pick locks.
Besides Aelita, Odd is the only character to be virtualized in all first episodes of the 5 seasons.
In the french version of Code Lyoko, he was voiced by Raphaëlle Bruneau.
Out of the original 5 Lyoko Warriors, Odd is the only one with a male voice actor in the English version.
First one to lose all source codes in Code Lyoko Evolution and also only one to recover bit of them.
In Evolution Odd's hair shifts from brown to dirty blonde quite often, since in lighting, his hair looks more similar to blonde, but only in certain episodes.
Odd is only one whos been virtualized by all other original members of the team and only one virtualized by Ulrich.