Or a Spirit, if your character is a Warrior. Shinka!!! does not ban or limit Digimon in any way, but we do handle levels differently than other sites might, so make sure you check out our Digimon Levels List.
Character applications are short and largely freeform. Write as little or as much as you want, as long as you touch on a few key points detailed in the application guidelines! Certain character classes or subclasses have their own template, so make sure you grab the right one.