FE:POR
Ike - Because he's awesome, and it's literally impossible to beat the game without him.
Illyana - I just like her.
Nephnee - game breaker. She's a damn good unit to begin with, and with wrath, resolve, and the Knight ward, she is borderline unkillable.
Mia - SHE COMES WITH VANTAGE. VANTAGE.
Kieran - It's traditional for me to use the red caviler.
Marcia - Best peg Knight available.
Titania - Not bad, as far as training wheel paladins go. She's also cool looking.
Lethe - Actually much better then Mordecai, if you leave the beorc guard on her. Powerful and fast. Also, in this game, there are no royal laguz around to make her horrifyingly redundant.
Soren - Powerful. And adept is nice.
Astrid: Paragon is an evil, evil ability.
Lucia - I like lesbians. Is that a crime? Although she is not actually a lesbian at this point. It's very complicated.
Nasir - Yeah, yeah, I know. Getting him is a bitch. But it's worth it.
Tibarn - He's awesome, and insanely overpowered.