Gunn's sire was a vampire who sired Gunn at the very start of the Fall of Los Angeles.

While he was explaining his 'plan' for coping with the current situation to Gunn, Gunn quickly staked him in disgust at what the vampire had turned him into, subsequently establishing himself as the gang's new leader.

After the Senior Partners turned back time to save Angel after Gunn killed him- undoing the Fall of Los Angeles in the process-, Gunn's sire attempted to turn him 'again', convinced that he could do it properly this time, but he was promptly staked by Angel mid-rant, who noted that he had no idea what the vampire was talking about but also that he didn't care.

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