I'd say thunder or lightning. Because:
1. Thunder lights up the sky
2. It's rare for people to get hit by lightning, though it does happen
3. The "wave" could mean the sound it makes after it appears.
Pride is necessary~
I lead the group and usually have no need to act~
There is an odd looking fish that looks nothing like me but has my name~
What am i?
I'm looking for the latest version (2023-05-03), which includes an omake "short novel" that was added in the 2022-11-05 update. Your post seems to be the only one with that version.