I hate RPG's where I can't see the characters during battle. Sad I know, but it's part of the reason I could never get into Dragon Quest or Phantasy Star. Tried them, but never really enjoyed them. However, I am interested in DQ IX.
When it comes to JRPG's, the battles have to interest me, or I don't really care to play it at all. Hence why The World Ends With You is one of my favorite games. Also why I enjoy the Tales Of... games and Star Ocean... the battle system.
THE JACKEL