This is Art Rosenbaum from the TV show. For the comic character, see Art Rosenbaum.
Prom dresses by day, indestructible super suits by night. I'm Art Rosenbaum, kid. Pleasure to finally meet you. 
- —Art Rosenbaum[src]
History
Art Rosenbaum is the designer and creator of costumes used by certain superheroes. He works out of his Tailor Shoppe. Art is also a regular tailor so the public won't know about his costume-creating. He designed a costume for Omni-Man (Nolan Grayson) when they first met, and later designed one for Nolan's son Mark. When Mark asked what his costume should look like, Art told him that a superhero name helps inform the costume's design. Once Mark ultimately chose his superhero name, "Invincible", Art was able to design and create the suit.
Trivia
- Voiced by Mark Hamill, who is most famous for portraying Luke Skywalker in the Star Wars franchise.