I actually really enjoy your voice for this character, but maybe try following the direction given.
Voice Actor
Takeshi is a pianist of the same age as Kousei. His aim was always to catch up and surpass Kousei on the piano since watching him play at a young age. His resolve is so strong to the point that Takeshi would even abandon an invitation for a piano competition in Europe in order to compete with Kousei. To Takeshi, Kousei was like his "hero". Takeshi is brash, energetic, and sometimes throws unnecessarily insults, but he is fixated on and determined to bring Kousei back to the world of music.
(reflecting, talking internally) "Heroes are powerful. Heroes are lonely... and they walk off alone in the final scene. He was just like that too."
(encouraging) "Hey, we're musicians. So everything's gotta be expressed in music, right?"
