Tahm Kench Causes Misery and Evelynn Causes Agony
http://ddragon.leagueoflegends.com/cdn/img/champion/splash/TahmKench_0.jpg Tahm Kench feeds on the emotional pain of others. He's found that the best way to cause misery is to give a person everything that they could want, and then to devour it before their very eyes. Tahm must work with subtlety to cause the most amount of despair that he can, so he makes deals with people and works from the shadows, orchestrating their downfall from behind the scenes.
https://4.bp.blogspot.com/-xE76BZqX9BU/WcZPbc7LanI/AAAAAAABFHU/vgNqoezHO2YYWkIPsM_bhVq6R1IbM_KNwCLcBGAs/s1600/DKZqT2NWsAAKRf1%2B%25281%2529.jpg Evelynn feeds on the physical pain of others. From what we've seen, she's much more straightforward than Kench is, as in most cases she chooses to be the lead actor rather than the director. She stalks her prey from the shadows, but when it's time she reveals herself as a charming woman and lures them in, right before she brutally tortures them, feeding on the agony she causes. Though she's mostly direct, there's still the issue of her seemingly sparing a child after killing their parents. Is it possible that she knew that that child would grow up to be a brutal monster hunter with a sadistic side? Only time will tell.