The practice of choosing one's friends based on any interesting quirks, hobbies or characteristics they may have, in hopes that having an interesting group of friends will result in oneself becoming interesting. Personality is hardly taken into account. Quirk hunters tend to treat their prizes like accessories and trade them like Pokémon cards.
Vanessa's a real treasure, I tell you. She rides a Vespa to work and has a pet chinchilla.
After three solid months of quirk hunting, Rodrigo had friended a Renaissance fair-loving guido, a Venetian carnival mask-collecting stripper, and an Arts student who wears eighties band shirts unironically!