Oh, I thought Theme was for like, what you'd wanna call it. But anyway, it's a reference to a character of mine. If theme isn't the name, I'm guessing it means the general "vibe" of the whole thing? In that case, I'd say go for, like, a kiddish, plucky adventure look. Something cartoony, but not too cartoony, you know? Like something that gives off the vibe of kids going on a modern-day adventure but getting involved in something way more dangerous. So something that gives off an Earthbound or Steven Universe vibe, you know?