Agent 4

Not much is known about Agent 4's background, except that they came from a town about 40 minutes from Inkopolis by train

Splatoon 2
After Agent 4 initially arrives in Inkopolis, they are swept up in Marie's quest to save the Great Zapfish and her cousin Callie. In Octo Canyon, Agent 4 completes various missions to retrieve stolen Zapfish, defeating many Octarians along the way. Eventually, Agent 4 confronts DJ Octavio and a brainwashed Callie, rescuing the Great Zapfish, freeing Callie, and finally restoring Inkopolis's power supply once again.

Agent 4 is described as a silent squid who goes with the flow even in raging waters, and values freedom and flexibility.[4] They also "blast through any situation with ease."[3] Agent 4 did not know who the Squid Sisters were prior to the events of Octo Canyon; this is because they did not watch TV for a while as they were busy with club activities.[5] Agent 4, as seen in promotional pictures and art, has a diligent work ethic, a lot of confidence, and is extremely free-spirited. Compared to Agent 3, they are shown to be more easygoing and relaxed,

Hair: Long, yellow-orange, with tentacle-shaped ends that are an brun Yellow and the tips are marigold.Eyes:orange eyes,an black mask-like marking around them, giving her a bold, expressive look.

Clothing:wear an upgraded version of the Hero Suit that once belonged to Callie.[3] They can pick up Armor to wear as well. They wield the Hero Shot by default but are later able to use a variety of other Hero weapons given to them by Sheldon.