How do you feel about having computer controlled players holding a place in the top 100 list?
In a competitive game I am thinking about, players can combat each other to grow their character as well as fight computer controlled characters. But when the players look at the rankings, should they NPC accounts be included.
Without the NPC in the rankings, you could see that you are ranked #19, the player in #18 place is stronger than you by 5 levels, but when you go to fight the other characters that are your level, you cannot see #18 because he is too strong, so all you fight are the NPC and players weaker than you but with in your attack range. This could be misleading to the player as they feel they are stronger than they really are.
And with NPC accounts in the rankings, player can really see how they rank up to other accounts that are as strong as them. They can see how many accounts stand between them and the next rank.
On a side note, some NPC accounts are marked as NPC while others are not.