In Yu Yu Hakusho it was difficult for me to tell how powerful of a fighter Koenma really is. He states on the Dark Tournament story that he would be no match for a regular human being ("I bruise too easy" and "I'm a ruler, not a fighter" are two quotes are his excuses) but against Sensui who not even Yusuke at his best at the time could not stop he was supposedly able to stop.
Some people seemed to feel that he's actually the equivalent of a S+++ demon, and that he was only wanting to hide his power during the Dark Tournament? Anyone else want to discuss that?