Rivet

Rivet is the business partner  best friend  roommate  assistant  close friend  work colleague  contracted employee  engineering tutor  bodyguard  housemate  supplier  co-conspirator  good pal  morally ambiguous counterpart  one-bunny construction crew  on-call plumber  bad influence  Wario-esque doppelganger  of Rust and chief engineer of Rabbit Railroad INC. Unlike Rust, Rivet isn't often seen out and about, instead preferring to spend her time tinkering away with whatever new project she's currently working on.

Appearance
Rivet is a soot-colored rabbit with slightly singed fur. Her eyes are a vivid orange and her long, seafoam green hair is tied into a messy ponytail.

Attire
She wears a gray striped engineer's cap, which forces her ears to fold down the sides of her head. Her main outfit is a dusty, tattered black conductor's uniform with a tie and white undershirt, with the sleeves rolled up so she can wear a pair of thick gray blacksmith's gloves. The plates of her boots, as well as her buttons, goggles and epaulettes, are all made from newly forged copper, as is a small pocketwatch sticking out of her coat – although she also sometimes wears a brass pair of goggles instead. She's mostly seen wearing a hefty copper backtank, which she uses to power her handheld machinery.

Personality
Rivet is very withdrawn, rarely speaking to others unless she requires something from them. Only Rust knows what she's actually like normally, and arguably even they might not know all there is to know about the enigmatic rabbit. Her public face, at the very least, is curt, rough, and clever.

Backstory
Given Rivet's aversion to sharing personal details, it's no surprise that her background is largely a mystery. She doesn't seem to be as at home in the desert as Rust, but where she comes from, or where she learned her engineering skills, is currently unknown to anyone.

Trivia

 * bnuuy