Vriska

Vriska Serket is a character from Andrew Hussie's webcomic Homestuck. She is one of the original twelve trolls that appear in the story, and although she doesn't make her debut until Act 5 of the webcomic, she's usually considered one of the most memorable and popular characters in it. Vriska was born on the planet Alternia and is around 6.5 sweeps (around 13 human years) old at the time of her introduction. She is represented by a symbol that looks suspiciously similar to the human star sign Scorpio (hmm). During the trolls' session of the game Sgrub, as well as in the time span directly preceding it, Vriska became involved in many instances of destructive and sociopathic behavior, including turning all her closest friends into cripples and colluding with mysterious cosmic forces (among others, a creepy old douche with a cue ball in place of a head). Vriska was punished for her behavior on numerous occasions, but has occasionally won the love of her companions for numerous random acts of heroism.

Involvement in the Schizozucced universe
Vriska originally had little to do with the Schizozucced universe, being a fictional character and all. This all came to an end when Yosif decided to document the lore of the shitposting community in text format, leading to the phenomenon known as "coming up with random bullshit". Thus, Vriska was weaved into the narrative, leading to a lot of so-called "meta shit", a concept that schizoposting just so happens to share with Homestuck.

Originally Vriska was used as a forced meme by Yosif and the few people who were willing to play along (notably Denis). However, she retroactively became Yosif's toxic ex-girlfriend whom he has very complicated feelings about. People with enough knowledge about Yosif lore would notice that a lot of his romantic interests over the years have shared certain qualities with her, and her personality has, on certain occasions ,rubbed off on Yosif himself. Additionally, there's a very popular theory out there that states that the term "Yosimp" originally came to be used in a certain relation to Vriska's existence. The specifics of this are unclear though.

Some people have implied that Vriska is a transgirl. The canonicity of this claim is dubious.

Vriska has been involved in numerous conflicts with Stef. Although both she and Stef share what one could describe as a right-wing system of believes, Vriska has repeatedly stated that she finds Stef's servility towards the Crown absolutely disgusting. Being a cerulean-blooded troll, Vriska occupies a specific position on the hemospectrum that prompts her to disregard the rights of most castes below hers, but her respect for authority can be described as notably lower than that of the average indigo or highblood. As such, she perceives Stef as a mere peon whose role is to be murdered.

Vriska is also involved in an ideological conflict with Mechev about the nature of the N-Word State of Mind.