"Captain Underpants" And His Siblings....

That is Captain Underpants (a.k.a. TJ) on the left.

Why does he call himself "Captain Underpants"? Because as soon as he steps foot in the house he strips off all his clothes except for his underwear and sometimes his undershirt (only if it's his white tank-top Batman undershirt, does he leave it on). Then he tucks the red cape from his Superman pajamas into the back of his underwear and runs around the house.