Kouta Nakanishi

He's a homeless magician that first appeared playing tricks in the street with his partner Michael. Basically Chouno goes in and out of being a homeless failure and a semi-successful magician. Saiki ends up helping him out every once and a while just on a whim, but doesn’t think very highly of him. Chouno has seen some of Saiki's powers, but thinks it's just stage magic. Because of this, he treats Saiki like a veteran illusionist and even calls him "master". At his most successful, Chouno had a weird comedy magic act going on.

(Source: Saiki Kusuo no Psi Nan Wikia)