Servant-in-Training

The Angler sleeps on the Ocean beach - wake him, house him, and he hands out one fishing quest a day (a specific fish from a specific biome, shown when you talk to him). Deliver the first and this pops. The chain continues at Good Little Slave, Trout Monkey, Fast and Fishious and the long march to Supreme Helper Minion! - and the quest rewards (Golden Fishing Rod parts aside, the tackle and info accessories) are how Glorious Golden Pole and Black Mirror happen.