Ideas

Born a mutant with Empath-like abilities.
Father was a grifter, traveling the south-east corner of the US.
Mother "died" during childhood.
Father ran afoul of Intergang and was killed.
Went to find/learn from Father's contact; A voodoo priestess living in New Orleans.
Learned voodoo. Woo.
Started working against Intergang, not because I was helping people but because I was hurting villains.
Got on the Avenger's radar after landing a significant blow to the Intergang's operations.