Polka (Eternal Sonata)
Maybe another Disgaea Character like Etna, she's almost as important as Laharl for the franchise anyway
Selvaria (Valkyria Chrononicles), she's the character that'd make the more sense in the game from that serie imo.
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Best LPer ever, Gix ! : http://www.youtube.com/watch?v=Vt5YKmP7ecY