Inner Agent 3

Inner Agent 3 is an extra boss in Octo Expansion.

Inner Agent 3 is unlocked by collecting all 80 mem cakes. The boss fight is initiated by investigating locker 8 near the vending machine in Central Station.

Gameplay
The fight takes place in a small arena with some cover available. The boss behaves like an Inkling with enhanced stats. In all phases of the fight, Inner Agent 3 is equipped with Hero Shot as their main weapon and Autobombs as their sub weapon. Inner Agent 3 has a dodge roll ability even though they do not have dualies equipped. There are five phases, and the player must disable Inner Agent 3's shield to progress past a phase. In each phase, Inner Agent 3 uses a different special weapon. Inner Agent 3's shield can be disabled by shooting them ten times, or by detonating a Splat Bomb near them and then shooting them four times, or by detonating two Splat Bombs near them. Inner Agent 3 will recover from damage over time if the player does not attack them.

Phase 1
Inner Agent 3 jumps down to the arena with Splashdown. Their special weapon is Inkjet.

Phase 2
Inner Agent 3 jumps down to the arena with Splashdown. Their special is Bubble Blower.

Phase 3
Inner Agent 3 jumps down to the arena with Splashdown. Their special weapon is Autobomb Launcher.

Phase 4
Inner Agent 3 stays on the floating platform. Their special weapon is Tenta Missiles. Inner Agent 3 can only be damaged by throwing Splat Bombs on the floating platform.

Phase 5
Inner Agent 3 jumps down to the arena with Splashdown. Inner Agent 3 will perform three Splashdowns in quick succession where the player is standing. After a certain amount of health is depleted, Inner Agent 3 will replace their triple-Splashdown combo with a single, on the spot Splashdown, only reverting back once they have recovered health.