Yes, Kirby is described in his games as a young male pink ball, and a "Young lad from Popstar".
Yin-Yarn is the evil sorcerer in Kirby's Epic Yarn
Kirby is a guy. Don't worry I got shocked at first too.
Who is Sir Kirby? Do you mean Meta Knight? (The guy with the golden sword and the mask) Do you mean Prince Fluff? (The blue Kirby with the crown from Kirby's Epic Yarn.) Neither one is related to Kirby, even though they are the same species as him.
He looks like Kirby Heyborn
Lucien Laviscount who plays Jonah Kirby.
If he is the guy who gets his brain read, I think he was also in TUrboTax (ask the box) and a KFC commercial
This is a hard one. He certainly looks evil. Apparently, though, he is considered an anti-hero, but I personally think that he really is a good guy.
There was no Shadow Kirby in Kirby 64. The Shadow Kirby appearances are: Kirby and The Amazing Mirror: Shadow Kirby was an enemy. Kirby Squeak Squad: Kirby could spray-paint himself to look like Shadow Kirby.
Crash kirby
He is the main villain. He pretends to be a good guy so that Kirby will unknowingly help him take over Dream Land. He looks like a bat wearing a jester cap.
Kirby, Meta Knight, Galactic Knight, Keeby*, Shadow Kirby, Red Kirby, Green Kirby, Blue Kirby,Marx** *Keeby=Yellow Kirby **Marx May be an altered Kirby.
There is no Dark Kirby in Kirby 64, but there is an enemy called Shadow Kirby in Kirby and the Amazing Mirror. Defeating Shadow Kirby gives you an item. But Shadow Kirby turns good for some reason.[Shadow Kirby was always good. Kirby was just being too arrogant to listen. See 'Kirby's Adventure' to see where this all started. ~zeroslash]