Kristina Horner is a member of Team Hypercube. She is also a member of The Parselmouths a wizarding wrock band. She is best known for introducing Nerdfighter Notes in which people write notes in John's books telling them that if they found that book (e.g. Paper Towns) they are a nerdfighter and made of awesome and they should visit the Vlogbrothers channel and ect. Kristina is a Hufflepuff pretending to be a Slytherin.  Kristina was also in the band ALL CAPS.

External Links:
Kristina on Youtube: Kristina Horner
Kristina on DFTBA Records 
Kristina on Instagram