I give a lot of my Sonic OC's human like hair, it often depends on the species, but for the most part I love that natural human like look.
For me the one insect I can justify hair on is moths, since many species of moth are already fluffy and while it's a bit of a stretch it still looks cute.Varies from group to group
Mammals - with the exception of Armadillos and hairless mammals, yes
Reptiles - Maybe some feathers, or a spike crest as a substitute
Birds - just style their feathers
Fish - no
Arthropods - some species do actually grow hair but generally it looks weird as shit so no
Mollusks - big no. Maybe do something like the Asari from Mass effect instead.
Cnidarians - Tentacles could work instead.
Other invertebrates - No
To my knowledge there's also a handful of Spiders, Crabs and Squat Lobsters that can grow hairFor me the one insect I can justify hair on is moths, since many species of moth are already fluffy and while it's a bit of a stretch it still looks cute.
That said I don't think I'd put a full head of gorgeous flowing, Legolas-esque locks on a moth character. More like just some fluffy bangs or short spikey hair.
It looks like a cute designI prefer anthros without humanoid hair. Usually I like them bald, but something like obstagoon's hair (from pokémon) is an exception because it looks more natural to me. It's sort've like a mane.
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Bro same. But I tend to just not care for facial hair in general.My avatar speaks for my opinions on it. That and I've posted here already.
The only thing I would add is that I really don't like facial hair on anthros. Super not my thing.