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Basic Trope: A character that is second in command of a group, officially and otherwise.
Straight: Duos is Uno's Lieutenant.
Exaggerated: Duos is, oh hey, named Duos. His first name happens to be Doble. He's got little 2's all over his underoos. He doesn't ever want to be promoted, because being second in command is his life.
Downplayed: Uno and Duos are equal partners but Duos follows Uno's lead for whatever reason.
Uno is a inspiring and creative leader but he needs Duos for the nuts and bolts of the missions. Alternatively, Uno is great at devising and executing a mission but he has No Social Skills so he needs Duos to be The Face of the group and meditate internal disputes.
No leader can do everything himself without going crazy. Having someone to help shoulder the burden of command keeps the job from breaking people.
Parodied: Duos is not human; he's a walking number.
Zig Zagged: Uno and Dous takes turns being The Leader and the Second-In-Command.
Averted: There is no second in command nor is there a first in command; the crew decides everything by majority vote.
Enforced: The show takes place on a naval vessel and wouldn't look right without a First Mate.
Lampshaded:"Any bright ideas, number two? Number one needs some now."
Invoked: Uno isn't working in any military-type capacity in which he'd actually be assigned a second in command, but he assigns one of his True Companions to the role because he considers it necessary.
Defied: Duos flips out when realizes he'll be Uno's number two and quits right away.
Discussed: "You'd think that Duos would have taken complete command of The Team by now. He's a better leader than Uno and he knows it."