I get the impression he is a point. The tail is as black as the ears, right? and eyes bluish?
Being a mix he may have any ancestry, may even have maine coon in him if he is biggish. But the nearest to compare with is ragdoll, the mitted seal point variation.
Ragdolls too can get quite biggish. Not in the class of the biggest of Maine Coons, but big enough.
Seal = black - and the body tends to darken up with years.
Mitted = with white, here the white socks and some white spots. Ragdolls usually dont have white - but there are variations whom has.
Point = "siamese mix", the points are darker than the rest of the body - tail, ears, masque on the face, usually also paws.
Not the most typical ragdoll, yet very stunning in his own right. If he likes people, attention, being handled, I would recommend to participate with him in Shows, in the HouseHold Pet class. He could do nicely there with these looks.