He's missing the super long ear hair tufts. Here's my guy for comparison

Little dude has got a skullet 😭

I’d say no, due to the lack of a mane

Probably a domestic longhair. Maine Coons have really distinctive heavy snouts, they're dramatically huge, like the size of a bobcat, and they've got this dense 3 layer coat that forms a lion-like mane.

If it's just some little dude that wandered up out of the world in the top 50th percentile of fluffiness, what you've got there is a domestic longhair. Probably introduce him to brushing while he's young because mats aren't fun, otherwise same operator's manual as a shorthair. Obligate carnivore diet, scatching post and sandbox, gentle scritches behind the ears, lots of naps, sunny windowsill for basking.

Could be a mixed-breed? I'm no expert, but things like that do happen.

Either way, what an interesting and special little genetic anomaly you've found. I had a cat whose belly -- and only her belly -- was covered in fine curls. Straight everywhere else. Never seen anything like it before or since.

Does your cat look like Ron Perelman? If so, yes. If not, no.

Idk they're like people, races/breeds are just made up nonsense. It's all one species felis catus, they can all breed together, and your cat is a unique and beautiful cat!

He is Mainly Coon

I don't know, but it sure is adorable.

Your pretty cat is obviously turning into Reed Richards. Congratulations!