Let it be known now, 9 times out of 10, you SHOULD NOT chase your enemy into an unwarded bush. Of course, everything is situation specific. Although in a situation where you do want to chase someone, champions like nocturne, singed, volibear, lee sin, and vayne are very fast characters with good gap closing abilities to compliment a chase. Oh, and malphite. After all, he is moving as fast as he can.
A note about gangplank, he is a very strong champion that has beastly sustain, harassment, and global presence, but he really isn't the most durable early/mid game. Rarely is it a good idea to chase someone by yourself with gangplank. If playing him, be very aware of the skirmishes your teammates get into, and try to assist accordingly with your ultimate. Eat orange, parrrley, win game