Who else would I be?

[YEP it's Mephisto. But unlike his dog form, this one isn't quite as "authentic" given he's put a little less effort into appearing realistic. A closer look will reveal his eyes to be exactly the same as his own: green and notably more cat-like.]

I thought perhaps something like this would be better than turning into a fish of some kind... and besides, aren't I adorable?

[He really needs to change his voice or something when he asks that.]