Regina Ferrum

The "Iron Queen" (real name Regina or "RF") is an Overlander who worked alongside the Iron King in the Dragon Kingdom. She is the Bride of the Four Houses and is capable of using magic spells against her enemies. After being chased away from the Iron Fortress by Sonic the Hedgehog, Miles "Tails" Prower and Monkey Khan, the Iron Queen remained unheard of for some time. Nearly two years later she came into contact with Snively and the two began a romantic relationship together with plans to overthrow Dr. Eggman as leader of the Eggman Empire.

Rulers in the Dragon Kingdom
Sonic and Tails first encountered the Iron King and Queen during their quest for Ixis Naugus, who fled across all of Mobius. When they arrived at Mount Stormtop Village, they learned that the Iron King and Queen crowned themselves ruler of the village. When the villagers refused to swear loyalty to either, the Iron Queen set Mount Stormtop on fire for over a hundred days and would not lift the spell until the villagers agreed to bow down to them. Sonic and Tails were told by Li Yeun that only the magical Fan of Fen Xing could blow out the flames on the mountain. When the two tried to retrieve it, the Iron Queen cast a spell on renegade cyborg, Monkey Khan, to kill Sonic and Tails before they arrived. They managed to free Khan and he joined them in assaulting the Iron King at his fortress. Sonic and the others returned to Mount Stormtop to blow out the flames, the Iron Queen tried to use her magic to stop them but failed and the flames were extinguished. The Iron Queen left the village swearing vengeance on Sonic. (StH: #60)

Plans to Rise to Power
Nearly two years later, Regina responded to Snively, who was doing a routine checkup on all of the Sub-Bosses around Mobius. After chatting over the Eggnet for some time, the two became romantically attracted to one another and began planning to meet up and overthrow Dr. Eggman. To show her affection, Regina sent Snively a cologne scent from her region of Mobius, which Snively enjoyed but Lien-Da found repulsive. As Eggman went into a decline in sanity and the Freedom Fighters pressed their advances against his ruined capital city of New Megaopolis Snively and Regina prepared to take over the empire. (StH: #194, #197, #199)

After Sonic finally defeated Eggman in a one-on-one showdown, Eggman lost his final grip on sanity and after the Freedom Fighters and Chaotix left, Snively locked Eggman in a padded cell in a straight jacket and headed to the landing bay of the Eggdome to greet Regina and her Yagyu Clan forces who had arrived via dirigible. (StH: #200)

Romance
Regina found love with Snively, Eggman's lieutentant and adopted nephew, while he was performing a routine surveillance check of all Eggman's Sub-Bosses. The two have since been talking to each other via the Egg Network and have become quite close, even sending each other gifts. Regina's only other known romantic relationship was with her "love" the Iron King, but it was strictly out of benefit and not romance. (StH: #60, #194, #197, #199)

Background Information

 * Due to her design, some fans thought she was an Overlander. It was stated in the letters page of  Sonic the Hedgehog #71 that the Iron Queen was a Mobian badger. However, Writer Ian Flynn stated that he considered her an Overlander given her character design, adding that the Iron King and Iron Queen's "titles are purely honorary and not romantic. They're together out of benefit, not out of romance" and that "having a human female wed to a animal character might raise some eyebrows." (1)
 * Writer Karl Bollers listed a number of possible plot points that were meant to be post-issue #134, many of them never seeing the light of day. Among them was one where Knuckles the Echidna headed to Kar Leung for some training under Monkey Khan, during which he would be brainwashed by the Iron Queen, while Khan himself would be brainwashed by Dr. Eggman, resulting in a 4-way battle for power between Eggman, the Iron Queen, Mammoth Mogul, and Rouge the Bat.
 * It was revealed as a spoiler in FCDS #3 that "RF" is the Iron Queen. This ended the long-time fan speculation that the two were the same character.
 * Some fans have speculated the "F" in Regina's last name stands for Ferrus, which means "Iron" in Latin just as "Regina" means "Queen".
 * The Iron Queen, along with the Iron King, holds the fourth longest non-appearance gap in the comics at 140 issues (StH: #60-200), tying them with the badnik Coconuts.