Rare tawog related post but one of my personal head cannons is that if Gumball were to major in anything it would be art related, and I mean any art form except for writing probably, I think he'd be an art or music major
My main defenses are that he's a very creative and expressive person as shown in the show, people who are like that tend to get drawn towards these types of things of self expression.
Another (for the music major one) is that its cannon that he can play the ukulele and from the times he sang sometimes in the show it was actually pretty good, so I feel like he'd enjoy composing music or something like that
And also its shown that he's actually a pretty decent artist, he can draw realistically even tho it isn't exactly realistic for the world he lives in. But I honestly feel like that adds to the point. A lot of artists draw in styles that aren't realistic. (Even though there are many artists that draw realistically, I just honestly think he wouldn't be one of them, since whats realistic for us isnt realistic for them in the sense of how we look and our surroundings if that makes sense)
And also another hc: people who were in the void but forgot about it due to the fact it probably can rearrange memories or something they still sometimes have strange dreams about it, this head cannon is something I thought of a pretty long while ago but I think its kinda cool, though someone probably already has that head cannon
Anyways that all im going back to hibernation