Creeper
He is a hostile mob
He will follow you
He can blow up
He is enemies with cats/ocelots
He is the only species of his kind
He comes out at night but survives the daylight
He looks like an alive army boot! :)

What would Creeper say?

Why are you called "Creep"er? (Question)
Because I look "CREEPY!" (Answer)

You see a cat and . . . .. . ?
I run and hide because I'm a wimp!

Why are you green?
Because I like green!

Why do you blow up?
Because I have TNT inside of me!

How are you fast?
Because I'm a ticking time bomb! I will blow up any minute now! So I run for some reason??????