Hmm for slice of life comedy you have lots of choices. Of course the big ones are K-On!, Gochuumon wa Usagi Desu ka?, Non Non Biyori, New Game!, and Ore Monogatari!!, and Nichijou etc. Others that were great were Saiki Kusuo no Psi-nan, Mitsuboshi Colors, and Tamako Market. But if you want to go older, I'd suggest Genshiken and Azumanga Daioh.
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