Glads are pretty fun, light sabers make beserker pretty nice in some areas. If you've got good water attribute stuff laying around sonic can be pretty brutal too. Main downside I can think of is the crow card collecting and no guard from what I've heard of it being buffed.
As far as achievements go, in makai kingdom, managed to beat the strongest character boss in the game as my 5th or so post game fight (flonne, etna, castille, laharl, then zetta I think. Zetta's pretty brutal in the fight, but is the best character hands down where it counts after you get him, other overlords tend to be better to go for first). I still have to beat the strongest vehicle boss though, other than that it's just clean up on getting the rest of the bonus characters and creating level 400+ish dungeons to arm them to the teeth. XD
Last edited by ShinMegami; 11-26-2012 at 02:23 PM.