Okay, Ike hates Jungle Japes. It WILL be the stage Ike bans every single time it's legal. Unless they showed up stoned.
Frigate can work, it's bad for Ike most of the time. He can make use of the ledgeless side though. Bthrow -> Fsmash or Dtilt fun.
Ike actually likes Rainbow Cruise due to the huge range on his aerial attacks (and Peach's terrible AD.), but I believe Peach could make better use of the stage then Ike. Just don't go above him unless you like Uair killing you early due to the low ceiling, and don't go below him unless you like getting spiked.
Ike LOVES Pirate Ship. Ban it if you want a hope of winning when it's his CP turn. Aetherspiking -> Dair spiking in the water, no gimping him, aether sliding, wind = lots of long lasting aerials, rock = wall infinity, platforms = anti projectiles, anti-dair combos, etc, Countering bombs and the catapult, just don't go here if you want to win.
Green Greens and Corneria are also good CP stages for Ike. Wall infinities, and close blastzones. Norfair isn't bad due to the fact he will get gimped less of the time and lots of ledges to snap onto. BF is his best neutral.
Ya, don't have much else to say.