Ancestor

Ancestors are a concept in Troll society. They are historical figures who lived centuries before the set of twelve trolls who are followed in Homestuck. Each ancestor is said to be a close genetic match to a particular troll, and young trolls believe that they are supposed to find clues about their ancestors. The ancestors are also intended to serve as role models for adolescent trolls. Each of the twelve trolls in Homestuck shares the same zodiac symbol and blood color as his or her respective ancestor.

The ancestors of the main twelve trolls were Ectobiologically created by Karkat Vantas. The layout of the tubes suggests that all 24 trolls were clones of themselves, but it's possible that the main twelve were created with the ancestors' genes.

Since the ancestors are associated with current trolls based on blood color, it is uncertain how Karkat Vantas found his ancestor, if at all, since he is said to be the only troll with bright red blood. Since both Vriska and Eridan named their Flarp characters after their ancestors, Terezi's ancestor may have been named "Redglare".

Eridan Ampora mentions the ancestor concept, believing that it's how he found Ahab's Crosshairs. (The obvious implication is that the Crosshairs may have belonged to Orphaner Dualscar.)

Marquise Spinneret Mindfang
The ancestor of Vriska Serket. Mindfang was a pirate and the leader of a notoriously deadly fleet of Gamblignants. In her youth, Vriska found a journal in an impact crater that told about Mindfang's life and had clues for hidden treasures, including Vriska's dice and massive piles of treasure. Mindfang was also the namesake for Vriska's Flarp character. Through her HS 5407 (journal), it is revealed that she had a kissmessitude with Orphaner Dualscar, Eridan's ancestor, which may have been Vriska's inspiration for her relationship with him. Mindfang seemed to have a habit of playing Redrom games with various trolls, most of them of lower castes, which Orphaner despised.

Orphaner Dualscar
The ancestor of Eridan Ampora, and Mindfang's kismesis. He may have been the original owner of Ahab's Crosshairs. He also seems rather possessive, despising Mindfang's Redrom games though she is only his Kismesis.