This Fire Emblem Heroes reroll tier list is updated day by day. To make if the most correct one, the ream really appreciate your suggestions/comments on that.
[Deep Devotion, 5 Star Focus] Seems to be the most versatile one due to skills such as Threaten Spd, Retribution, and Fuzin Bow. Can deal with all but a foe with high Def.
[Summon: either, 5 Star only] Has relatively high mobility among healers. Not a tough character, but can restore HP of it self by the "Live to Serve" skill.