hmm, well at first glance, it looks like a Euphorbia of some kind - I think Plumeria leaves are a bit broader, slightly shorter, with more rounded tips, and also with distinct veination, which I can't see on these leaves, but it's hard to be sure. You'll soon find out - Plumeria needs to be kept at 50 deg F as a minimum, very tender and needs to be in a conservatory, so if that plant is outside, it'll keel over if it is.

I think Euphorbia, too. Don't know which one, though.

Agree looks like a Euphorbia to me

think its Euphorbia Stygiana.

Can't say about Euphorbia, but deffo not Plumeria.

I'd say Euphorbia too.

Hi. I thank you all for the help and It's 100% Euphorbia Stygiana without any dubt.