I'm aware that Yoru and the War devil are the same person but the story gives us an official name for the character. Is likse calling Pochita, chainsaw man.
Posted under General
For some reason every depiction of mitaka asa is getting three tags: mitaka asa, war devil (chainsaw man) and yoru (chainsaw man). What exactly is each of these tags meant to represent?
Checking online, it seems that the War Devil ordinarily looks like this. In Chainsaw Man Part 2, the War Devil takes over Mitaka Asa's body (now having facial scars), and to internally distinguish themselves from one another, the War Devil adopts the name Yoru.
I can only assume that the Yoru tag exists to avoid making it harder to find a) depictions of normal Mitaka Asa; b) depictions of the actual War Devil; but then War Devil was tagged on all Yoru posts, or something, I dunno.
The devil possessing Mitaka Asa's body only got her "human" name a few chapters in, so in the beginning, war devil (chainsaw man) was all we could tag her as, and this seems to have stuck. However, now that she is known as Yoru, I believe it'd make the most sense to keep this name for her human form and limit War Devil to the monstrous one, following the pattern of other bodysnatching devils (e.g. Power vs Blood Devil, Reze vs Bomb Devil).