I think we should blame zoifox for my new ninja. His name is Steve. Yes, Steve. It just seemed appropriate, somehow. I gave him fist weapons - highest affinity for ninjas. He typically doesn't inflict a one-hit kill, but if he's fighting something with enough counter-attacks, they'll have a little counter deathmatch, where his high evasion rate brings him out firmly on top.

Here's my Disgaea party breakdown so far (parentheses mark future units):
Laharl > Blue Skull > Green Skull > Red Skull > Male Cleric > Star Skull
Laharl > Ninja > (Samurai)
Etna > Female Cleric > Rogue > (Scout?)
Etna > (Female Warrior > Female Brawler)
Flonne > Archer > (chain just like Laharl's, only female)
Violette the Prinny > Male Warrior > Male Brawler

I'm planning on including a Rune Knight, but don't know where to fit her in.