Captain 8 (eight isn't an official agent though-)

She met captain cuttlefish before he gave his position to 3, I wouldn't be surprised if he made her an official agent

Cap called them agent 8 because of their amnesia, there’s no evidence of them interacting with the squidbeak splatoon after OE was over

Eh, it's still gonna be my headcanon anyway.

💀

Tbh I wouldn't be surprised if 3 herself made her official either