The blue in Superman is Blue Moon. Which seems nobody can say what flavor it actually is.
https://www.atlasobscura.com/foods/blue-moon-ice-cream-midwest-mystery
it depends on who makes superman, on which flavors are in it. There are 3 or 4 makers of it, and each have different flavors for each color, either way its good.
**Superman ice cream is believed to have originated in the Detroit-based ice cream shop Stroh's,[1] though the exact origin remains elusive. Another Michigan dairy House of Flavors in Ludington makes their Superman ice cream with their signature Blue Moon, cherry, and lemon ice creams. The flavor has been spotted in other Midwest locales, such as Chocolate Shoppe Ice Cream Company in Madison, Wisconsin.
Thus the exact combination varies from location to location, typically with vanilla, Blue Moon, and some other variety of ice cream included. The Stroh's Ice Cream version has Blue Moon, red pop, and lemon ice creams,[2] while other versions such as those by the Meijer store brand ("Scooperman")[3] and the Hudsonville Creamery & Ice Cream Company ("SuperScoop") versions of Superman ice cream are a mixture of vanilla, Blue Moon, and black cherry ice creams.[4]
Scooper's Ice Cream Treats in Stratford, Ontario, Canada sells a similar blue, red, and yellow variety but calls it "Super Hero" ice cream. Laura Secord Chocolates also sells a similar variety of ice cream, called "SuperKid," made with banana, blueberry and strawberry flavors.[5]