Polar Bear Cafe
This show is awesome!
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Click to view
I mean you have Sakurai as a Polar Bear, Kamiyan as a Penguin, & Jun Fukuyama as a Panda. It's also pretty funny & clever. I don't know the novelty might wear off for me (it usually does with comedy series) but I am sticking with it for now. XD
As for other spring anime I also enjoyed the hell out of Space Bros
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Probably my two favorites of the season so far (although Sakamichi no Apollon still has yet to air).