Seeker
From Inkipedia, the Splatoon wiki
Seekers are a type of Sub Weapon in Splatoon.
Description
Upon deployment, Seekers chase after the closest enemy to them, leaving a trail of ink in their wake. Upon reaching the targeted enemy, they explode in a burst of ink. The Seeker's AI is not particularly intelligent, and should be aimed directly at the opponent if possible. The Seeker will also explode if it hits a wall.