Dark-san is one busy guy. He has a relationship with everyone!
Let's start at the bottom. First we have:

	Takeshi - He's a journalist & stakes out all of Dark's targets.
	With - Dark's familiar. He's sorta like a rabbit. He is what gives Dark his wings.
	Risa - She's in love with him.
	Satoshi - Tries to catch Dark. He is also a Hikari.
	Krad - He is Dark's other or opposite. They HATE each other.
	Riku - She hates Dark. Dark likes her. A Love/Hate relationship, ne?
	Daisuke - Alter-ego. At first he isn't too thrilled about the whole Dark thing, but soon their relationship becomes friendly.