Not much of a "buly", he's just a walking tease & joke. Nothing more.
Wears wears a purple, long-sleeved shirt, dawning a yellow warning sign with a black skull symbol on it, yellow pants, & green shoes.
Likes to block students' way and mock them for having nothing in exchange of making Spike leave, but still will move in 3-10 seconds anyway.
Has own poster that says "Brand new student to Dave's school! He's a bit of a bully though..", but ignore the poster, Spike is not a bully to everyone.