Sotiris Vantas

Sotiris Vantas is the father of Karkat Vantas and is an ex-auror turned self-imposed-exile turned Defense Professor at Hogwarts.

Personality
Sotiris is rough around the edges and has a lot of inner anger. He swears more than anyone else, with the exception of perhaps his son.

Time at Hogwarts
Sotiris started at Hogwarts in the 1997-1998 school year, just after the Ministry fell to Voldemort. He spent much of his first year at Hogwarts living in the Room of Requirement because his mouthy nature had led to him becoming a target of the Carrows and the upper year Slytherins. Notably, just before the Battle of Hogwarts, when Voldemort demanded Harry be turned over to him, Sotiris yelled back. Sotiris also attempted to stay and fight.

During his time at Hogwarts, Sotiris made friends with two of his housemates - Leonna and  Meiriona. The three caused all manner of shenanigans during their time at Hogwarts.

As an Auror
Sotiris and Leonna together entered auror training after graduating from Hogwarts. They quickly formed a partnership and became a rather formidable pair of aurors. Unfortunately, this led to them catching the attention of Felt agents, which led to their capture and Sotiris being exposed to repeated applications of the Cruciatus curse.

Living with the Muggles
After his escape from the Felt Agents who tortured him, Sotiris was nursed back to health by muggle Shreya Vantas. The two soon married. Sotiris settled into muggle life and it looked like he might be able to make a full recovery, but Felt Agents started skulking around once again, and in the fall of 2011, Sotiris had to flee for his life.

Self-imposed exile
Sotiris' hidden location for the next decade and a half would be the Kamchatka peninsula in Russia. There, he lived as a muggle fisherman, oblivious to the fact that Shreya was pregnant when he left. He occasionally sent owls to Leonna to assure her that he was still alive.

Defense Professor
Roughly fifteen years after leaving for the Kamchatka Peninsula, Sotiris was tracked down, though this time not by the Felt, but by Leonna, begging him to return because the old Defense professor at Hogwarts, Jack Slick, had gotten into trouble with the ministry and had been forced to resign. She managed to convince him that Hogwarts would be a safe haven from The Felt, and he accepted the job offer and returned to Britain.

His first day of teaching, he met Karkat, a fifth year Gryffindor at the time. Both were rather surprised by this meeting. They then began the slow process of getting to know one another.

Skills and Attributes
Sotiris is a skilled Auror, meaning he is good at defensive magic as well as at charms and hexes. He is also rather skilled at teasing meaning out of prophecies, though he thinks divination is a joke.