Kamakiri - He's just plain annoying! The only good scene with him is the "Hey, Kamakiri" "Yo?" "Don't 'yo' me!" To me, he's the worst GDW character ever! Blech!
Lucy - Thanks to her, Sakura's dead!
Blue - He just appeared and died. That's it.
Gin (Anime) - I think Gin is awesome but in the GDW anime he's always the character being held as prisonor and I just hate it! GDW anime ruined Gin!
Kurotora - I don't know why, but I hate Kurotora in GDW.
Ken - No personality whatsoever!