Of my three avatars, this is one hundred percent my worst to become.
In scenario one, you better hope I get teleported away, because I would be big. I mean really big. Bigger than that. Way too small. Even bigger. I'm talking "my teeth are the size of the observable universe" big. So, It would have to be a pretty far away teleportation.
In scenario two, I'd already be outside expanse of the universe, so it's not a problem.
Either way, the result would be the same for me. I am way too big to participate in anything in the world, or any orld. I don't really have any peers, so I can't really interact with anyone...
First thing I would do is change my diet. Be a vegetarian, essentially, and only eat universes where there is no and never will be any life. It seems like a decent thing to do. Maybe I'll take up farming.
After that, I'd spend a long, long time trying to figure out a way to make a scale clone of myself small enough to fit on a single planet and eventually small enough to fit inside a building. It would be very hard, but I have nothing but time, and it would be possible. Then I could actually interact with people again.
Maybe I would grow a universe with intelligent life on my back, and just be a god to them. Once I can get the scale clones working that would be an amusing hobby, if I don't find a fun enough world that exists on its own.
The only difference would be, in Scenerio two I'd have to deal with Black. And, well, I'm not exactly sure how I would handle that.
I'm not going to kill him, obviously, but I'm not going to let him kill me either. I could try to learn how to vomit, to free his waifu that way, but that seems like an exercise in futility. I think my only option would be to make a scale clone and have it venture inside my own stomach. It would be difficult, but not impossible.
Regardless, this is not a fun avatar to turn into.