Agatha Harkness

Stole forbidden knowledge & secretly practiced dark magic;
1693: Caught by her coven, witches tried to kill her, her powers took over, killing them
1750: Became pregnant, giving birth to her son, who was sick & frail
1757: Son died, tricked witches to steal their powers
2023: Attempted to take Wonda's magic, defeated, stripped of her powers;
Mind was trapped as a sitcom character
2026: Spell was broken, sacrificed herself to save Billy Maximoff from Death;
Returned as a ghost, joined Billy in searching for his brother as a guide