Fan Casting Fifteen in Battle For Dream Island

Fifteen seems to be quite aggressive, yelling at Nine and Six when they arrive at her home. When Nine and Six pose as Fifteen, she's greeted very excitedly by the other numbers (which they speculate as the reason for Fifteen's isolation). Fifteen also has some violent tendencies, as shown in Thanks for 2,000,000 Subscribers, where she beats up Nine when they returned to get their sunglasses back, using a flamethrower on Nine when they attempted to retrieve their sunglasses again, and on Fourteen (when divided by Two) just for him even approaching her home (under the impression of getting free tasty skin). Fifteen, as a fusion of Six and Nine, basically has no character. Their body is controlled by Six and Nine. They're able to talk inside. If fusion has a character, then it most likely combines or alternates Nine's and Six's characterizations.