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ANYTHING! Canon, OC, AU, Canon!OC, genderbends, doubles, etc. etc. As long as people are having fun and as long as a character isn't seen as just having been created to troll the comm, anything can played.
Sentient animal characters can be played, too. The only requirement is that they are able to communicate with others somehow. Animal characters are not confined to staying in one room, but if they're larger than a dog, they'll have to stay in the Rec Area of the Home Realm.
YEP! If they can communicate and have somewhat of a mind of their own, bring them on over. If they are Transformer size, they will be sized down to 7 feet.
All doubles must be from a different canon point, unless one with a certain canon point is dropped. Then you can canon-update/degrade them to that point.
There can be as many doubles as players want. If there are 10 Narutos walking around, it might get a little annoying and people might be tired of seeing the character around. If there are 3, though, that might be more acceptable. But if players don't care about seeing 10 of them, and they're all consistently played with, then go nuts.
If you have a power a normal human couldn't have, it is DISABLED in the Home Realm and City Realm. You can try to use them, but nothing will happen and you'll look silly. IF THE POWER IS ESSENTIAL TO YOUR CHARACTER SURVIVING, THEY WILL BE ALLOWED TO CONTINUE USING IT, BUT ONLY TO LIVE.
Otherwise, powers work in most of the realms. In the Wilderness, War, and [Broken] Realms, they have no limitations. The only catch is, the citizens of each realm will have some fail-safe activated in them so your character can't obliterate them or the realm. Powers also work in the Glitch Realm, although you'll find that 50% of the time, they'll randomly decide to not work or they'll work strangely. Hence, the name "Glitch."
CHARACTERS.
What kind of characters can be played?
What about animals?
How about robots?
So, doubles.
There can be as many doubles as players want. If there are 10 Narutos walking around, it might get a little annoying and people might be tired of seeing the character around. If there are 3, though, that might be more acceptable. But if players don't care about seeing 10 of them, and they're all consistently played with, then go nuts.
So, how do powers/abilities work here?
Otherwise, powers work in most of the realms. In the Wilderness, War, and [Broken] Realms, they have no limitations. The only catch is, the citizens of each realm will have some fail-safe activated in them so your character can't obliterate them or the realm. Powers also work in the Glitch Realm, although you'll find that 50% of the time, they'll randomly decide to not work or they'll work strangely. Hence, the name "Glitch."