User blog comment:LeeeeeeeroyWarudoooooo!/Hunter X Hunter Most Powerfull Characters/@comment-14902757-20140622011713

I assume this list only includes characters in the anime whose abilities/powers we've already seen or at least a portion of it. My list is not based on the stregth of a character's special ability. My list assumes that each character is unaware of other's speed/ability and there's no drama involved prior to fighting ;D.

1) Meruem 2) Netero 3) Matured Gon 4) Chrollo 5) Zeno 6) Pitou 7) Kite 8) Youpi 9) Silva 10) Pouf  11) Killua Godspeed 12) Morel 13) Bisky 14) Razor 15) Feitan 16) Hisoka 17) Phinx 18) Illumi 19) Cheetuh 20) Kurapika Emperor Time

2 Factors I considered 1) The speed by which one is able to activate his/her technique. 2) how resistant/durable one is against his/her enemy's attack. Remember that one's skill in ren can greatly nullify an attack but for the Royal Guards there's basically enough aura to shield them against weak attacks.