Cryptid.

No, I’m serious – the subway twins are actual cryptid-like beings in L&L. They just showed up one day and decided to build the Battle Subway and don’t really age and are Most Definitely Not Human but they keep Nimbasa’s subways safe and their battle challenge is a huge hit so most everyone loves them anyways. By the fankid era… they’re doing the exact same thing they’ve always been doing and probably will be doing for the foreseeable future. They’re secretive, quite odd, definitely have a cult following, but are overall Cool Guys.