So from the characters we got
Munch = Edvard Munch
Gogh = Vincent van Gogh
Katsushika Hokusai = Hokusai (the Japanese artist)
Klimt = Gustav Klimt
Kroma = Pablo Picasso
So all the "Imaginators" that we've met have been reincarnated artists from Earth. But the only character that isn't is Hinata.
For Kroma, going by his painting names, we can assume he is probably suppose to be Pablo Picasso. But he's also the only one who doesn't go by his first or last name. When we meet him, he does say that reincarnation can mess with their memories. But I wonder why Kroma's reincarnation made it so he turned back into a similar age as Hinata and he doesn't use his own name. I feel like if we see his backstory, it's gonna be insane.