Mr. Frederickson

"I wear them front, I wear them back, I go inside out, then I go front and back."

- Fred's Father

Fred's Father is Fred's wealthy father.

Background
According to Fred, his father gave him the family mansion while he and Fred's mother were away on a vacation to the isles. In the post-credits, Fred discovers a secret lair behind a painting of his family. Fred's father then appears to his son's amazement and reveals how he has once lived a double life as a superhero. Out of joy and relief of reuniting with him, Fred hugs his father, who hugs him back and tells him that they have a lot to talk about to each other.

Trivia

 * Since the release of 20th Century Fox's X-Men in 2000, Lee has traditionally made cameo appearances in films based on Marvel Comics properties. Big Hero 6 marks his 22nd appearance in a Marvel-based film. As of March 2016, he has appeared in 24 films based on Marvel Comics.
 * Him being a superhero is a reference to his past role as the Mayor of Super Hero City in The Super Hero Squad, where he fancied himself a superhero. It could also be a reference to his role as the voice of the future version of Tony Stark in Avengers Assemble.
 * While his name is unknown, it is known that Fred's (and thus his) last initial is L, making it at least possible that the character's name actually is Stan Lee.