Ni no Kuni: Wrath of the White Witch

Is it like Pokemon where they can change into something new altogether(like losing or gaining limbs/heads) or is it like how Oliver's main Imajinn just gets a better sword and armour when it reaches stage two.

Also is there a Totoro looking monster becuase I thought I saw one but wasn't sure.

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PSN Drmoogle. RPG fans check out Ni no Kuni: Wrath of the White Witch out Q4 2012

They aren't that much different it can be a bit underwhelming to some imajinn like a color change.

Yes there is a totoro looking creature there is a green one and a white one. They give a lot of experience and are a good way to level up since they have low hp. You have to kill them quickly though because they run away.

There's also a Golden Totoro that gives a bunch of Gold.