There was never really any point to the personalities in v1 either. xD After it was hatched, no one ever saw the personality. It wasn't displayed with the rest of its stats or anything.
They had personalities in V1, no one would know what their pet's personality was after it was hatched and it didn't really do anything. Anyways, just write it in the pet page. I mean, if there was a feature to pick personalities, would it really be useful?