Nanu is a former member of the International Police and nowadays spends his time being a local cop for Alola. His personality falls somewhere between being chill and almost flippant in a way. He gives off an air that he doesn't care about much and is a grumpy older man of few words, but if you even remotely mess with something he does care about, you're in for a world of hurt.

Nanu's voice needs to be deep, gruff, slightly one note, with just a hint of disinterest to it. That's not to say he's an emotionless robot, he's just been worn down by the world and does his own thing. For voice references, I imagine something almost like a tired/bored Soldier 76 from Overwatch (https://www.youtube.com/watch?v=Rb0PGVs2nFg ), but feel free to only take loose inspiration from that and do your own thing.