[quote=@Automaton]
So, is there a specific character sheet for the Arena?. If not anything i should add in that Is crucial?, this is my first arena character and i want him to be memorable :/.
[/quote]

Well, technically your character can't access anything you haven't mentioned in battle. Most people don't bother to mention their characters senses and the like and then activate super-human hearing when it's convenient which is technically ballshit. 

Mostly just ensure you've been as descriptive as possible, don't use vague terms like 'superhuman strength' and then assume this will allow you to overcome an opponent who has actually said how much their character can lift. Anything vague can pretty much be reinterpreted by your opponent to work against you.

I tend to split my CS into Identity: (appearance, name, gender, personality etc.) Physical Traits: Strength, speed, agility, durability, regeneration, senses. Skills: Learned abilities, fighting styles etc. Abilities: (Magic goes here.) and finally Backstory: This isn't technically compulsory, though some rare characters have the ability to exploit backstories so they should be there for convenience. 

As long as you have all these bases roughly covered you'll be fine.