I don’t know why gargoyle is capitalized here, but it may be a setting-specific thing (and I can’t ask the writer), so I’m going to leave that alone.
Replace non-concealable with unconcealable. Then get rid of the comma after unconcealable.
You don’t need to hyphenate nonhuman.
Even though this example isn’t meant to be a complete sentence anyway, I’ve combined the fragments to make it flow better.
Very isn’t always a “filler” word that should be deleted, but sometimes it is.
A male half-Gargoyle whose nonhuman ancestry is obvious and unconcealable but not particularly disturbing.
(WordPress’ spell check wants me to replace unconcealable with inconceivable. I think that’s funny.)