The nickname / codename is just a working code so we can discuss that kind of unit; the name hasn't been decided. It's the same as when we reflexively say "thumper" to our mining helper as a reference to another game. (I literally can't remember its proper name)
While in lore there is Japanese influence, using literal Japanese language in the real world will make the game alien to most of the world.
With these two in mind, it doesn't make sense to hobble together Japanese words to translate the working codename. Saying that, you'd do well to explore other names (in a new post). You can lean toward an almost-Japanese flavored sound, but the lore is also heavily-American so it could go either way or have an "accent" of sorts.
Nov 18, 2021
https://en.wiktionary.org/wiki/necropost
While in lore there is Japanese influence, using literal Japanese language in the real world will make the game alien to most of the world.
With these two in mind, it doesn't make sense to hobble together Japanese words to translate the working codename. Saying that, you'd do well to explore other names (in a new post). You can lean toward an almost-Japanese flavored sound, but the lore is also heavily-American so it could go either way or have an "accent" of sorts.
Nov 18, 2021
https://en.wiktionary.org/wiki/necropost
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Pandagnome