What breed is my little Bruce?

He is 5 months old, almost bigger than my 13 year old cat. When I first adopted him he was very black but now as he gets older he is black with some grey and in the sun he is brown and grey and black. He has a very long coat. I would just like to know what breed he is.

He is a domestic - alike the great majority of cats are.

He seems to be a medium hair - its not very visible on the photo, but you write he has long fur...  We will see better when he is adult.

Re his black color changing color.  This may be natural, but I had read here a tip, sometimes its because of the lack of tyrosine, a type of aminoacid.  (a sort of proteine).

So depending on his actual diet, if its already good all round diet for kittens, so there are supplemets containing tyrosine.

But if his food isnt  optimal for kittens, a better balanced food may be enough...

Just a tip, I really dunno.