You can go into any fictional world

Butttttt the magic of creating an entire world takes up a lot of the effort so you're left being a low tier character

For example:

Minecraft? Dirt block

Adventure time? Banana guard

Pokemon? Klefki

Terraria? The dirtiest block

Lego? 1x1 stud

And so on

I'll let you guys determine what an equal character or variant is based on my list. You can keep your knowledge of the world and your earth world intelligence so you can make something of your new body like becoming a glitched dirt block, becoming one of the banana guards that are cool and talented like we saw and so on. You can't change from the character though like evolving kelfki into a legendary. Have fun!