Mariko Konjo is a cheerleader from Seisyun High School.

Mariko is a common Japanese name meaning "child of true benefit." This could be a reference that she benefits the teams she cheers for and ensures that they do not lose, or simply that she's vain, trend-obsessed, and used to the spotlight. Konjo is broken down into "today's law," which could also be an ironic reference to the fact that she helps her teams break the rules.