Ish keeps his mask on because his unusual fangs and teeth don't bode well with most species. He actually prefers the mask on and has grown used to it, feeling it as a piece of self-identity. But when he needs to scare someone...

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I was never fond of the "Ish is embarrased of his tusks/teeth/fangs" thing I came up to justify Ish's mask. So here's some rewritten lore for it. The last time I drew unmasked Ish was... 2014. It was time to do an intimidating change to him, but for those who hate this change, Ish will still keep his mask on by default. I just found the old lore to be derpy to the core.

2017 ref is still valid, though I'll make a better drawn one sometime in the future.