Linking wont do you any good so I'll just reply with a translated Korean Tier list.
S+
Dark Nazdan (+damage leadership + aoe nuke + healing on auto attack)
Light/Dark Eldin (+turn speed leadership + long range + even more turn speed passives. Dark one has silence)
Light Arin (+magic attack leadership + aoe heal + revive)
Light/Water Arandel (Defensive leadership + great survival + aoe shield)
Wind Feria (+ effect accuracy leadership + invincible shielding with life leach + heal based on her attack, meaning squishier targets can be fully healed)
Any Deathmond (+physical attack leadership + able to drag enemy towards her + great dps enough to have warranted her a spot on S+ as any element) (Water/Light for single target Wind/Dark for AOE
S
Water/Light/Dark Garreth (Offensive leadership + Probably best single DPS + great AOE on some Garreths)
Fire/Dark Tolkin (Aoe after Aoe)
Light/Dark Lycian (Evasion plus Physical leadership + Stealth along with great DPS + possible nuke due to +60% stealth skill)
Any Fairy (Unique 3 star with AOE heal + HP based defensive buff?)
A
Fire/Light/Dark Aslan the lion dude (+ turn speed leadership + AOE + tankish DPS)
Water/Wind Alexandro (+HP% leadership + Doesn't do much for team, but very tanky + +40% more hp or Heal under certain hp treshold)
Fire/Dark Kindle (+ Phys leadership + Surprising single target DPS + execute skill)
Any Lylis (Decent leadership, decent starting place)
Water/Light/Dark Edgar (Ok Tank/Offtank)