I use Kisame Religously, Hes very underrated an needs to be used right.. Hes best also with high initiative.. I put him up front and Mood his HP and get benefits from the HP boost from tactics. He basically makes it so that you have the advantage of having the opponent react fast or get punished.. if you cast his mystery, it should be combined with someone who can acupuncture like Ao or Mei.. and if they wait to cast their mystery after you, then they cant cast at all... the first few rounds you have the advantage of forcing them to use up the unused chakra, but after that, its basically a fuel to his already devastating Standard Attack, he gets 3% attack for every chakra over 40.. that's + 180% attack. He heals himself constant through chakra gain. To me he's one of the best ninjas out there right now.