Star Diamond

Star Diamond is a major antagonist of My Little Pony: The Shadows, as well as the main antagonist of Star Shine's backstory, and one of the two main antagonists of the Star Shine spinoff series. He's the biological father of Star Shine and Candy heart, as well as the ex-husband of Shooting Star, Eclipse's father-in-law, as well as the maternal grandfather of Eclipse and Star Shine's kids.

= Backstory = Not a whole lot is known about Star Diamond's childhood or teenhood, but as an adult, he was known for abusing and torturing Star Shine when she was a kid, as well as making her childhood a living hell. He forbade Star Shine to do anything that involves being social, and not to leave the house at all times, and thus, he was also known as a mad alcoholic who couldn't control his anger. Years later, the cops discovered what crimes Star Diamond committed, and thus leading up to him being arrested.

= Personality = Star Diamond is shown to be abusive, selfish, murderous, as well as a madman and hostile, hence why he abused Star Shine for many years.