I search a story with a real monster MC, not one who befriend human or other race, he don't trust other monster either but can colaborate, not a hot blooded one.

Mine has a Monster Mc, and he never befriends any race. The 'doesn't trust others' isn't really relevant to my story. My story is calmly paced, with a calm MC, so it might fit your need.

'Nazuss' pid='831033' dateline='1513363480' Wrote: I search a story with a real monster MC, not one who befriend human or other race

if just those requirements.
https://royalroadl.com/fiction/12712/parasites-and-magic

i'm the only reviewer still apparently... but it reads.

This isn't like most stories on RRL, not even close. Not even sure it could be qualified as Anti-Hero. This is (as of ch23-beka2) a straight up monster fiction, told from the viewpoint of the monster. Uncaring, brutal, Imagine boxxy (if you read that story) or his summons having no leash, or no want/need to blend in. I have to say it is well written, very little errors, and definitely full of action at this point. I don't think the true story or plot has really kicked off yet, if anything its still teaching us about the world.

If you don't mind a lot of gore, if you don't mind a lack of empathy, and are looking for something a bit different give this a shot.

https://royalroadl.com/fiction/8894/everybody-loves-large-chests
can't get much more of a real monster
a lot of mature content

idk much about "can collaborate" part, but there are such moments