iam looking for person reincarnation as a monster manga.

like these two:
Tensei Shitara Slime Datta
Re:Monster

Kumo Desu ga, Nani ka? (Novel) but I haven't read it so I can't tell you if it's good or not
Goblin no Oukoku (Novel)

wait, turns out there's a tag for that:
https://www.mangaupdates.com/series.html?category=Reincarnated+as+a+Monster

oh, Overlord (Novel) is not there, but many people agree that it's really good (I haven't read it yet either, though)

hope these entertain you ^^

edit: there's also Garudeina Oukoku Koukoku Ki (Novel) , though he's not exactly a monster

iam after manges rather than novels

but i do like "Kumo desu ga, nani ka?"

thank you any more

iam sorry