For the record, and for anybody who HASNT considered this before, note that the description of "appropriate target for a coherent wave" implies that a class-C type Zero is either:
A) Hugely resistant to wave force
Or
B) Multiple cubic kilometers in size. Or in length, but probably size.
We
killed that. Solo.
#AnnaFuckYeah.
@Pinklestia if you like your OC so much, write an omake. Maybe you don't do a lot of writing, but if you like the idea enough, you'll be able to write it. That's what got me to write Vae. But, the OC does not fit into this quest. Members of the 300 exist whom with their frame are on par with Anna. But explicit in quest is that no one without a 300 frame exists who is even close to her. Additionally, the UN has child soldier laws, so the OC would be an adult or a Shuri clone.
... But that's what you're talking about. You want a Shuri clone who isn't an asshole. Or, if you prefer, you want Yukari, who is EXACTLY what you are talking about for an OC except slightly scaled back: not as much trauma, not as much skill.
And that is why your OC cannot fit into this quest: the characters whose roles it would take on already exist.
So, again: write an omake.