That's Samus's fated rival, Ridley.

That's the reborn through cyborg and genetic engineering, Meta-Ridley.

That's Meta-Ridley corrupted by Phazon, Omega Ridley.

Pha-what?

That's the result of the Parasite X copying Ridley's DNA, Neo-Ridley.

That's the clone of Ridley obtained from genetic material stuck to Samus's suit.

I can't see any difference from the old one though!? How...!?

It's totally different, you moron! Look closer!

Come on, Pit...

Where did I go wrong in your education...

Eh...?