For this one:
Author Appeal: Billy's glasses, as noted below.
Badass Bookworm
Blind Without 'Em: Lose his glasses and he's up a creek.
Henshin Hero (When Stacy lets him)
Hot Scientist (Maybe not to the meatcrew, but just ask his harem in Angel Grove)
She Fu: A rare male example. Look at all those flips.
Sesquipedalian Loquaciousness (Translation: fond of unnecessary big words)
The Glasses Gotta Go: Happens in canon, averted in Trans_9. I'll pout if anyone tries to invoke this trope on him.
The Smart Guy (One of many here)
Technobabble: And tons of it.
Teen Genius (Again, one of many.)
TV Genius (At least at first, but he's improving.)