The Mantis was a member of The Rain City Super Hero Movement.
The Mantis became a super-hero after seeing Phoenix Jones on the news. After Jones unmasked himself after being threatened by the DA, Mantis realized it was someone he knew. This prompted Mantis to become a hero like Jones.
After stopping fights, helping the homeless and helping the authorities catch a man who stabbed a man, he eventually stopped being a hero. After pawning a bulletproof vest given to him by Jones, Jones offered to fight him and stay friends, or not and stop being friends. He would have to leave the group either way. Mantis chose to not fight him and was kicked out the Rain City Super Hero Movement.
Mantis is now a YouTuber and runs a channel called TKs-Mantis, where he has talked about his time as a "sidekick of Phoenix Jones".