Helios

Helios is one of Serena Millicent's three wolves, the other two are Selene and Echo. They were presents from her aunt Anita and cousins, Ruby and Dorothy for her sixteenth birthday.

Upon getting them, Regina and Robin were afraid of the trio attacking any of the other kids, Anita assured her brother and sister-in-law that she would never get a threatening or dangerous species of wolf. She later explained that he was a Snow Wolf, which means he always wants it to be cold or snowy.

Serena later named him Helios after the sun god and began training him. Over the years he's learned basic things like "Sit", "Roll over", "Lie down," and to not go to the bathroom in the house. But he's also been trained to hunt alongside Serena, her brother and their father, fetch her potion ingredients and to be calm during fireworks on the 4th Of July or gunfire during hunting season.

But the one thing he can't be trained on is looking for snow. Serena has "told" him time and time again that snow only comes for a little portion of the year. He doesn't understand what she means, but rolls along with it anyway, which Serena is confused, annoyed with and impressed all at the same time.