I'm not sure NinjaNightCrawler did this right (you're supposed to pick one of your own characters that fits the prompt the person above you posted), so...
For Ninja's prompt: Forget crossing it: Theo would want to climb it.
For Crisiscrimson's prompt: Theo's super friendly, so I wouldn't be surprised if this were him, too.
New prompt: Which OC would dance in the rain?