Naafiri Runes explained
There's one set of runes for Naafiri on patch 14.23 that is the clear favorite for LoL players and pros alike. The best Naafiri rune paths on the position 
Mid are 
Sorcery as the primary path and 
Resolve as the secondary path with a pick rate of 45%. Besides picking runes on Naafiri you should learn how to play Naafiri and if you are interested in pro matches take a look on how a pro builds Naafiri.
Naafiri runes from primary path
Sorcery empoweres abilities of Naafiri and increases the available champion resources. Most of high elo players – and our LoL pros in the the major regions – have agreed that 
Arcane Comet is the best keystone rune to run on 
Naafiri. This keystone rune adds more damage to your abilities and increases your power in the laning phase. Other primary runes on Naafiri are 
Manaflow Band, 
Absolute Focus and 
Scorch.
This is usually followed up by taking Manaflow Band for additional mana and mana regenaration. Absolute Focus grants additional damage while Naafiri is alomst full health. Scorch increases your control in the early game.
Naafiri runes from secondary path
When it comes to your secondary path, most Naafiri players prefer to go with Resolve. Resolve empowers the survivability of Naafiri and increases the tankiness. On the Resolve path, the best runes for Naafiri are 
Overgrowth and 
Second Wind.
Overgrowth increases your maximum amount of health. Second Wind powers up your sustainablity in lane by healing after taking damage from an enemy champion.
FAQ for Naafiri Runes
Which is the best keystone rune on Naafiri?
The best keystone rune on Naafiri is Arcane Comet. This Naafiri runes setup is then referred as Naafiri Arcane Comet.
What runes does Naafiri use?
Runes from the paths Sorcery and Resolve are the most used runes on Naafiri. For the exact pick rates of Naafiri runes used, you have to study the rune distribution presented.