Kenichi: The Mightiest Disciple (2006)

S1E49 The Mightiest Transformation! The Ryozanpaku Rhythm!

Struggling to dodge Ryuto's relentless punches, Kenichi begins to fight back by shifting his techniques, mimicking the distinct styles of his masters. This unexpected approach leaves his mentors both horrified and entertained as they watch their personalities come to life in his movements.