Erma

Erma and the others had been visiting friends and family down south when Dr. Ivo Robotnik began his tyranny, forcing them to stay hidden within the region, unable to return home. When Robotnik's Weather Annihilator drastically altered the weather around Knothole, the Knothole Freedom Fighters found themselves trying to endure the sudden cold while Robotnik tracked them. They were soon found by Flip, who lead them to his friends; the group of displaced Mobians had been hiding in the cavern system but had adjusted the climate within to suit their needs by using technology stolen from Robotnik. While unwilling to fight back themselves, they helped the Knothole Freedom Fighters adjust to the winter conditions caused by the Weather Annihilator. After a week, the Knothole Freedom Fighters attempted to disrupt Robotnik's operations, only to be captured by Snively Robotnik and trapped in a block of ice. Finally deciding to get involved, Erma and Sealia attempted to free the group (Erma using a saw to help Sonic the Hedgehog escape the ice) while the others chased off their foes. With Robotnik's plans foiled and the Weather Annihilator destroyed, Erma and the others were finally able to return home, doing so in a vehicle stolen from Snively.

Much later, the Arctic Freedom Fighters contacted Rotor to inform him that the herd, his family included, had been freed from Robotnik's control. Rotor lived with them for months until, once again, they suddenly fell under mind control and turned on him. Rotor very narrowly escaped; he was rescued by Erma and the others, who watched over him as he recovered. Erma and the other Arctic Freedom Fighters were also among those present attempting to repel the Xorda Attack on Mobius.

In 3237, the Arctic Freedom Fighters sent a transmission to New Mobotropolis requesting assistance; the enslaved Walrus Herd was being used to construct and guard what seemed to be a refueling station of some kind, and a local branch of the Dark Egg Legion was overseeing the operation. Sonic eventually arrived to provide backup; upon greeting the Arctic Freedom Fighters, he admitted he hadn't been sure they had remained a group in the first place. Guntiver the Wolf explained that initially, they were more of an activist group; at this, Erma pointedly interjected that "Some of us had wanted to be more proactive." This earned her a glare from her leader, but she didn't back down. Prompted by Sonic and Guntiver, she then went over the group's plan of operations; with a visual aid, she went over in detail the actions of the Dark Egg Legion and the structure of their base, explaining that an emitter atop the base's tower ensured the Walrus Herd remained enslaved. As only Flip, Sealia and Augustus would be able to attack the base's underwater portion, Sonic was needed to support Erma and Guntiver in attacking its upper half. When Sonic explained that Rotor could not join them due to the severe injuries he had received during the Destruction of Knothole, Erma reacted with sadness.

While the group set off for the base, Sonic wondered why it was always the Walrus Herd being used against them, and Erma replied with the "obvious" answers that the walruses made up the largest population and had the most influential city of the region. The team soon arrived near the base and took cover; Sonic noted that there seemed to be bad weather moving in from the north, and Erma impatiently told him that if he was there to help, he needed to focus on the mission.