In the Shadows We Fight (for justice and ourselves)

The life of a sidekick isn't glamorous. It's being a henchman minus the law-breaking. Heroes get the glory, and villains can do whatever they want. Sidekicks are merely tools that are sometimes mentioned.
Tommy Innit, Tubbo Underscore, Ranboo Beloved, and Purpled (no-last-name-given) have the worst luck. The heroes they work under aren't the best.... In the sense that they are physically and emotionally abused by the "good guys".
When these four have a chance encounter at a cafe, they get an outlet for their messed up lives. Even better, they get adopted! Sort of! Not without loud complaining (Tommy-)