|Bench press||100 kg|
Niinobu Kasamatsu (笠松新信, Kasamatsu Niinobu) is a member of the Taiyō Sphinx. He is the second-largest lineman on the Pyramid Line, though he is more rotund than muscular.
Kasamatsu is short and heavily built with a huge mouth and thick lips. His face and stature are incredibly wide resembling a block. In the spirit of his school, Kasamatsu also sports tan skin, winged eyeliner, and a black bobbed haircut.
It's shown that Kasamatsu enjoys gloating and taunting the other team, casually dismissing the Deimon Devil Bats as "noobs" before their match. He is loud and boastful, and apparently not very intelligent. Against the Deimon Devil Bats, he falls prey to the Devil Bats' shifting block schemes, and is also defeated on two occasions by Kazuki Jumonji while on offense.
Like the rest of the team, he faces against Deimon for the right to play against the Nasa Aliens as part of the line. He is defeated by Jumonji and is knocked back onto his back. The Taiyō Sphinxes acknowledge that they were symbolically beaten and forfeits the match against the Nasa Aliens to Deimon despite the game ending in a tie. Kasamatsu only reappears in the Kanto Tournament. Like the rest of the linemen, he sports multiple scars on his face and body due to the rigorous training the team underwent. However, like the rest of Taiyō's line, he is severely injured against the Hakushū Dinosaurs and the team does not advance past the quarterfinals.