|“||Grand Mam prides herself on her impenetrable steel armor! Even the bullets of the Friend Star bounce off her harmlessly. Team up and experiment with abilities to find her weak points, and bring that clanking calamity down!”|
|— Grand Mam • Kirby Star Allies|
Grand Mam wears large black armor and has a pink ribbon on her head. Her arms are black bombs, decorated with skulls, that can be cut and detonated with Fire-element rope-cutting abilities. She is also larger than most bosses in Kirby Star Allies.
Grand Mam debuts in this game as the eleventh boss, and is fought in Far-Flung - Starlight Heroes in Grott Moon. She attacks Kirby and his friends when they are on the Friend Star. Her main three attacks involve slamming her bomb fist into the ground, charging across the screen, or summoning enemies in the middle.
Her armor is impervious to all attacks, so to break it, the battle plays out as more of a puzzle. Kirby must first wait until Grand Mam uses her punch attack, getting her fist stuck in the ground and revealing a large rope. The Friend Star must then have a user of the Sword or Cutter ability to fire cutter attacks which will slice the bomb off. While Grand Mam is stunned from the knock-back, Fire Kirby or Burning Leo can shoot the fuse of the bomb, causing it to ignite and explode. The explosion breaks Grand Mam's armor, leaving her vulnerable to any attacks and making her unable to use her punch attack. After she is dropped to half health, Grand Mam will regenerate her armor, forcing Kirby to repeat the process on Grand Mam's other arm. She can then be shot until defeated.
Because the Grand Mam fight is designed for the Friend Star, and the Friend Star (which requires Kirby) is exclusive to Story Mode, Grand Mam is the only boss in the game that does not appear in The Ultimate Choice. She also does not appear in Guest Star ???? Star Allies Go!.
|“||There is a bomb on each hand! To fight back, cut the rope and light the fire!”|
|— Watch the weapons on each hand! • Kirby Star Allies loading screen|
- The music that plays when fighting Grand Mam is the Clash at Castle Dedede music instead of the standard boss music.
- Grand Mam uses Coily Rattler's roar each time she roars.