I haven’t really looked into Callie and Marie yet, but I know their voices are keity.pop(Callie) and Mari Kikuma(Marie). Finding some of their non-splatoon music is pretty difficult tho.
But with Pearl and Marina, it’s actually pretty darn cool.
Pearl’s voice actress, Rina Itou, is the lead guitarist and vocalist of a rock band called “Lighter190E”. You can find their stuff on Spotify&AppleMusic, and when you hear it, you can totally tell it’s Pearl’s voice without the Inkling Filter on.
Then there’s Marina’s voice actress, Alice, who’s a half-American, half-Japanese J-Pop singer, specialized on soulfull, balade-like songs. Again, you can totally hear Marina in her work, and it’s just cool to hear these vocals without the seafood-people filter on it.
Rina and Alice are actually pretty good friends and extremely proud of their involvement in Splatoon, to the point that on their official YouTube channels, they will often drop likes on comments that just go “Pearlie~!!” or “Ma~ri~na~!”
They even did an (unofficial) Splatoon-themed livestream on LINE together, where they answered questions about their opinions on their characters, sang together (without the filter!) and fangirled over the then-upcoming release of their Amiibos. Somebody uploaded recordings of said livestream onto YouTube, but sadly, nobody has subtitled them yet. I promise they’re pretty darn cute tho. All clips from the Stream here:
sky's stuff 