Lutes

Lutes stands out for two things : (1) A 10% stacking PATK buff, and (2) he gives 5 shields to the front ally when another ally dies. The (2) is especially useful, because it is a completely new tactic, or to be more specific, new way of giving shields. Only other units that can give shields are Lin and Wedding Lin, and both have different requirements. He is also useful for a Klaudteron tactic. 
On the healing side, he's alright: 125% to 2 units is fine for me. Continuous recovery doesn't matter usually for most people, because near the end game you're trying to one-shot everything anyways. But I can still see it being used in some niche in the future, perhaps.