Trip is the younger sibling between himself and his sister Penny. Being the youngest in Charlotte's family, Trip is the only member who does not question BoJack's visit to Tesuque. He plays for his school's basketball team, but complains that he is not good enough to be taken off the bench by his coach. As the youngest sibling, he is currently going through puberty.
Although his age is never explicitly stated, Trip is in the throes of puberty and as such, is constantly amused or bewildered by his body's changes and has frequent erections.