C.Q. Cumber

"This is C.Q. Cumber, a humble sea cucumber who works as a subway conductor and guide to the underground test facility. Despite his mysterious looks, this diminutive dude is a total pro and takes his job quite seriously. Whenever you’re in trouble, try talking to him."

- Live from the Squid Research Lab

"Welcome aboard. / All passengers with CQ-80 devices can press to display the Deepsea Metro map. / ... / Leave nothing behind.  / ..."

- C.Q. Cumber's speech on the train before looping

C.Q. Cumber is a character in the Octo Expansion for Splatoon 2. He is a translucent blue sea cucumber (likely a sea pig) wearing a train conductor's hat. He is an employee of Kamabo Corporation, serving as the conductor of the Deepsea Metro, and is shown interacting with Cap'n Cuttlefish.

He was first shown in the March 8, 2018 Nintendo Direct explaining the usage of the subway map to Agent 8.

Octo Expansion
Upon receiving a CQ-80 and a CQ Card from the Telephone, Cap'n Cuttlefish and the newly christened Agent 8 board the Deepsea Metro. Once aboard, C.Q. Cumber introduces himself to the Captain and the Agent and adds 1000 CQ Points to the CQ Card.

At each station, C.Q. Cumber instructs Agent 8–and, thus, the player–of the objective, the hazards, and requirements of the upcoming test. If Agent 8 continues to talk to him, C.Q. Cumber will tell them to “take care out there”, indicating he does care about them at least somewhat. If Agent 8 does something that either fails the test's requirements or precludes the possibility of completing the objective (e.g. causing an 8-Ball to fall off of the stage), then C.Q. Cumber informs him or her of this before declaring the test failed.

Following the defeat of the final boss, C.Q. Cumber mentions that Kamabo Co. has ceased to exist. Despite this, he assures Agent 8 that the Deepsea Metro is still running, allowing Agent 8 to complete any tests that he or she missed.

Trivia

 * His name is a pun because it sounds exactly like his species name, "sea cucumber."
 * Despite being an employee of Kamabo Corporation and, by extension, the Telephone, Hisashi Nogami has stated that C.Q. Cumber is "not a bad guy", only "faithful to his duties."
 * C.Q. Cumber may be seen climbing on the wall near the entrance of a test chamber. If you shoot at him, he will fall and land belly-up.