As suspected by fans, Grant is playing an older Loki who was dressed in the spandex costume of earlier Marvel comics. He’s known as Classic Loki.
Then there’s DeObia Oparei playing the MCU’s first Black Loki, who is seen holding a golden hammer not dissimilar to Mjolnir. Perhaps some sort of Thor hybrid, he’s known as Boastful Loki and maybe’s he’s worthy?
Next up is Jack Veal as comics favourite Kid Loki, who fans had been speculating would turn up to join the Young Avengers later on.
Others theorised to be part of that team are Hailee Steinfeld’s Kate Bishop, who will debut in Hawkeye, WandaVision’s Tommy and Billy aka Speed and Wiccan and The Falcon and The Winter Soldier’s Elijah Bradley aka Patriot.