The main protagonist of SteamWorld Dig
- Distressed Dude: His actual fate in the sequel was being strapped to Rosie's mecha and being used as a living battery. Good thing Dot came after him!
- Nice Hat: A simple yet nice-looking cowboy hat. He even tips it in versions with animated dialogue sprites.
- The Quiet One: Fits this more than being a true Silent Protagonist, as he does speak twice in the game: During the intro cutscene, and during the cutscene before battling Voltbot. He keeps talking in the sequel, even if he's really weak at that point.
- Scarf Of Asskicking: A red one, and he lives up to the asskicking part when he storms Vectron. NPCs in the second game even mention his scarf when talking about him.
- Sudden Sequel Heel Syndrome: Seems to have undergone this, if NPCs thinking he was responsible for the earthquakes and him being worshipped by a cult as a destruction god are any indication. Maybe Vectron got to him after all... Just kidding, Rusty's still a good guy, as he was actually trying to keep the earthquakes from getting even worse.
A citizen of Tumbleton, and the main protagonist of Steam World Dig 2.
- Girlish Pigtails
- In-Series Nickname: Dot.
- Little Miss Badass: Seems fairly young for a steambot, but is more than capable of trekking across the sequel's worlds, smashing monsters' heads with a pickaxe, and destroying a mech suit piloted by a Shiner with Rusty strapped to the front.
- Promoted to Playable: Was not playable in the first game, but is the focus of the sequel.
- The Assimilator
- Big Bad: Of the first game, and of the series as a whole, due to his roles in Dig 2, Heist and Quest.
- Cyber Cyclops: Has one red eye from which he fires Eye Beams.
- Flunky Boss
- In Case of Boss Fight, Break Glass
- Shielded Core Boss
- Shock and Awe: In contrast to the other robots, he is powered by electricity rather than steam.
- Walking Spoiler: Has little to no foreshadowing before he appears.
- We Can Rule Together: Attempts to do this with Rusty. It doesn't work
The Yonker Family
Ma Yonker, and her children Mic, Luke, Josh, and Zebulon, are citizens of Tumbleton.