Firework has a rocket launcher which shoots out fireworks that explode on impact (also people can ride on it)
Firework likes Glovel and Balloony
Firework's favorite holiday is New Years
Firework probably wants to kill you
If he feels like it, Firework will literally turn you into a firework
Firework emits sparks when he is excited
Firework can explode into confetti at random, the explosion is very strong and everything in a 20km radius will be destroyed and covered in confetti