Here's for another DEATH BATTLE idea:
Berecca VS Inkling (Ninjala VS Splatoon)
- All I did was look up matchups for Inkling, and this seem to not only be the most popilar but I also like the idea

...even if I haven't played that much Ninjala
but which Inkling (if a spesefic one) should be used?
well Idk...but I'm thinking the original Agent 3 from Splatoon 1 aka The Captain in Splatoon 3

but most likely they'll just go with Inkling as a species
and combine The Captain, Agent 4 and the new Agent 3 into one
Why not Agent 8?
well cause she's an Octoling, and this one's about the Inkling itself