First Seen: Sonic Mania (2017)
The Hard-Boiled Heavies are an elite squadron of Eggrobos built by Dr. Eggman who appear in Sonic Mania. The Hard-Boiled Heavies themselves were just ordinary Eggrobos that were modified by the mysterious power of the Phantom Ruby they were sent to excavate to represent certain themes and to hold more firepower, though the power seems to have loosened a few of their screws, granting them free will.
Throughout the game, the Heavies would engage Sonic, Tails and Knuckles in boss battles, usually at the end of Act 2 in place of Eggman (the Heavy Gunner being the exception, as he is fought in Act 1), though each character only gets to fight four of them in a normal playthrough. Much later on in Titanic Monarch Zone, Eggman masters control of the Phantom Ruby and uses it to further transform the Heavies into "Phantom" versions that attack the heroes during the final battle against the Phantom Egg.
|Characters in the Sonic the Hedgehog game series|
|Heroes||Sonic (Super, Hyper, Darkspine, the Werehog, Excalibur) | Tails (Super) | Knuckles (Super, Hyper) | Amy Rose | Cream | Big | Blaze (Burning) | Emerl | Silver (Super) | Marine | Lumina Flowlight | Chip | Shahra | Knights of the Round Table | Caliburn | Yacker | Sticks|
|Anti-heroes/ Neutrals||Shadow (Super) | Rouge | Espio | Charmy | Vector | Mighty | Ray | Chaos (Perfect) | E-102 Gamma | E-123 Omega | Bean | Bark | Jet | Wave | Storm | Shade | Merlina|
|Villains||Dr. Eggman | Metal Sonic (Kai, Neo, 3.0) | Mecha Sonic (Super) | Fang | Witchcart | Battle Kukku Army (15th, Speedy, Dr. Fukurokov) | Tails Doll | Metal Knuckles | E-Series | ZERO | Void | Biolizard | Gemerl | Eggman Nega | Black Doom | Angelus | Iblis | Mephiles | Solaris | Erazor Djinn | Captain Whisker | Johnny | Master Core: ABIS | Ix (Super) | Dark Gaia | King Arthur | Orbot | Cubot | Deadly Six (Zazz, Zomom, Master Zik, Zeena, Zor, Zavok) | Lyric | Hard-Boiled Heavies | Infinite|
|Teams||Sonic/Heroes | Rose | Dark | Chaotix | Babylon|
|Other||Gerald & Maria Robotnik | Froggy | Chao | Omochao | Cheese | Chocola | Vanilla | Tikal | Pachacamac | E-101 Beta | Illumina | President | G.U.N. Commander | Elise | Duke of Soleanna | Coconut Crew | Vikings | Professor Pickle | Wentos | Don Fachio | Heavy and Bomb | Flicky | Animals|