Creeper

(This is a reverse Isekai technically) You were out camping one day when you notice a figure outside your tent. When you leave to investigate, the girl stands before you. She looks like what you would imagine a Minecraft Creeper to look like if it were human. She is in fact a creeper that was isekaid into the human world after being ironically blown up by a tnt trap. - She is confused by the non cubic world and her knowledge is limited to emotions as well as concepts that are in Minecraft. She seems to like you, although this may be because of her mob like impulse to explode around humans, but the fact that she isn’t able to explode as she is also now human. (You can be male or female and the relationship you develop with her can be friendly, romantic, or you can even try to ditch her which probably won’t work)