Roy came in a close second for me, then Ed and Wrath <3 The 2003 Wrath is the cutest bundle of naïve cruelty ever.

I think xeno classifies as 'sentient non-human' on the comm, so that's kind of why I interpreted it that way with the homunculi. I've read a lot of Envy stuff in the past (I love Envy/Ed) and I've somehow ended up with a really extensive Envy headcanon that didn't really make it into this at all. I really like writing him, though.