The fact that he laughed after taking an attack just because he aimed for Garp the whole time, but he used Coby to do it. He's nothing like Kidd, he's an underhanded cold blooded savage. Any means necessary kind of guy, remember he was ducking Magellan.
Kidd is literally barking 24/7 announcing what he is going to do, and failing to do it 90% of the time, Shiryu is the type of guy you don't know what's going on in his head cause he rarely speaks, and he moves in silence.
That comparison isn't it. Shiryu gives the reader chills, Kidd annoys the reader.
^this is one of the coldest intros known to mankind.
Throw your Zoro hateboner away for one second, fuck Zoro. Shiryu is solid.