It has to be said: During the Zero arc, Kosukegawa, dressed up as a Kamen Rider, goes one on one with Zero herself. After taking a few hits, he actually counters her move and then is in a position to beat her. That's his Crowning Moment of Awesome. For what he does afterwards, see the Heartwarming page.
Tatsuya killing a bear with his bare hands. 'Nuff said. Apparently that's just something he does regularly.