Jack-Jack

"'Wawa wa wawa!' - Jack-Jack saying, 'Because I'm Batman!' in baby talk"John Jackson Parr, better known as Jack-Jack, is the infant son of Bob and Helen Parr. Initially believed to not have superpowers, Jack-Jack actually boasts a myriad of powers, such as laser vision, telekinesis, levitation, teleportation, and shape-shifting.

In HISHE canon, Jack-Jack is a frequent guest at the Super Café.

Super Café: Swingers Tribute
Helen makes baby faces at Jack-Jack at the Super Café. Superman, who is a couple booths away, believes that she is flirting with him, but is disappointed when she leaves with Jack-Jack.

How Incredibles 2 Should Have Ended
Jack-Jack is first seen inside the Incredibile as Dash and Violet plan on using their powers to rescue their parents from Evelyn Deavor. Afterwards, Jack-Jack joins his siblings at the Super Café, using his powers while eating cereal. When Batman remarks that he regularly gets in trouble with the cops and rhetorically asks if Dash and Violet know why, Jack-Jack morphs his face to resemble Batman's cowl and babbles Batman's catchphrase in baby language, causing Batman to spew coffee from his nose.