Will the free Kirby: Star Allies DLC ever stop? Sure. But for now it's going strong and will host Taranza, Kirby's frenemy from Triple Deluxe in the near future.
Her intro trailer is short and sweet, beginning with a quick Triple Deluxe recap before moving into her Star Allies moveset. As a spider she obviously has access to webbing powers, as well as a sort of catch-all command over dark magic. It looks like she can also summon the main villain of Triple Deluxe: Queen Sectonia.
Remember, Star Allies was released all the way back in March and has hosted numerous free DLC characters since then. It's only gotten better.