RICHMOND – The most famous and infamous characters in the multiuniverse gathered for the Richmond Mushroom Festival under 13-year-old Aidan Leroy’s Brick By Brick awning. Grogu in his high-tech stroller. Mando in the helmet he prefers not to remove. Groot, the vocabulary-challenged, extraterrestrial, estranged cousin of an Ent. The spell-caster, Harry Potter; and his half-giant friend, Hagrid. Spider Man, looking amazing. Dr. Strange and his comedic sidekick, a magical cape. The one-gloved – not to be confused with Michael Jackson – Thanos. “We try to catch the popular trends, so we’ve got the new Captain America-Falcon,” complete with shield, Leroy said. “I’m excited for Season 2.” These Marvelous and DC characters, along with denizens of other universes that find a nexus in Lego Land, did not come from a kit or store. Leroy makes them. “I try to do most of it custom-painted and built, because I know a lot of people buy Lego sets and their children just play with the Lego…