First Age?

Person? No
First Age? Yes

related to the elves?

An animal?

An animal? Yes
related to the Elves? Meaning genealogically, No

War-Beast?

War-Beast? No

Is it a horse?

Is it a horse? No

Is it an animal used by evil forces?

Is it an animal used by evil forces? No

Is it a wild animal?

Is it a wild animal? Yes

Is it the moths that were around Luthien?

Is it the moths that were around Luthien? No

Thorondor?

Thorondor? No

The great boar of Everholt?

The great boar of Everholt? No

Huan?

is it rabbits?

Huan? No
is it rabbits? No

do they go on four legs?

Wargs?

do they go on four legs? No
Wargs? No

spiders

spiders? No

do they fly?

do they fly? Yes

Crebain?

I say eagles Gwaihir says "Eagles can not be tamed"(not exact)

and crebain I thought about but Firfoot says they are not used for evil purposes

Nightingales?

Crebain? No
Eagles? No
Nightingales? No

Maybe the butterflies of Nan-tathren?

According to the legends of the Lost Tales, this was the place were butterflies of all kinds came into the world, and they remained common there during the First Age.

(If that should be correct, then please continue without me if Im not back in a day or two)

Probaly already said but are they Evil creations?

Does it have a specific name?

Hmm...uh...hill trolls. They were used for evil, but they weren't an enslaved race like orcs!

Maybe the butterflies of Nan-tathren? No
Probaly already said but are they Evil creations? No
Does it have a specific name? No
Hmm...uh...hill trolls. They were used for evil, but they weren't an enslaved race like orcs! No

Barrow-Wights?

The swans Tuor met in Vinyamar?