Well... You know how Black Hole's brother was mentioned recently?
So yeah, this is Vortex, Black Hole's YOUNGER brother... Who is currently MUCH, MUCH bigger than him (since Four shrunk him).
I was thinking, in the BFDI guide, it's mentioned that while the Black Hole we know and love is much more humble, other black holes are very proud of the fact that they're the centers of entire galaxies.
So that means that Vortex's personality could differ from Black Hole's more down-to-earth approach to life. He would probably be a little more careless (in contrast to Black Hole's death preventing obsession), but that's often due to the fact that he isn't as mature as BH because of their ages.
I wonder if they have yet another sibling, who is still a star...
I headcanon that the II (Inanimate Insanity Infinity) Black Hole is like, their little (edgy) cousin. Probably a distant one.
A Black Hole family reunion... That might not be that good of an idea.