Relationship between Keyleth and Vex'ahlia

Keyleth and Vex'ahlia are good friends. During Vox Machina's adventure in the Underdark, the group took a vote on whether or not to search a waterfall they found below a bridge. Vex and Keyleth, who both wanted to search, lost the vote but decided to act on their own; this led to them meeting the mindflayer Clarota.

Vex held some resentment towards Keyleth for a while due to Keyleth's growing relationship with Vax'ildan, but eventually Vex came to accept the couple.

While Vex was at times irritated with Keyleth's insecurities, she also cared deeply for her, promising to look after her for Vax. By the end of the campaign, the two told each other that they considered themselves sisters.