I have an idea. It's not the best, so, don't judge. What if you take a name of one of your favorite Marvel characters, and a name of one of your favorite Star Wars characters, and combine them somehow?
Sorry, I'm not too creative. You should try Thalia's idea, it sounds better than mine. I mean, I made my username after a singer/youtuber.
I'm sure whatever username you chose, it will be awesome, just like you. Also, when you get an account, can you please tell me that you are #phonelesshomeschooler?
~ Your friend, Wraya <3