User blog comment:Mich, Michele & Kuhla/Future Units Preview/@comment-24506549-20150521025305/@comment-25209037-20150521032355

The nearest old unit 7☆ Will-sama can compare to is Sefia, but Will-sama leans more on the defensive side due to his stats. Will-sama is an excellent Arena lead w/ 48 BC DC (12/4 DC). His SBB provides both offensive and support buffs: increased BB/SBB/UBB damage buff + HoT. UBB is a combination of Magress' & Vargas: 100% mitigation against dark units + 100% 80% ATK/DEF debuff.

ES is largely worthless & certainly troublesome, Medulla + Light buff to party on BB/SBB use. Kinda redundant since Grah leads are very common. To unlock this, however, requires spheres that are very difficult to get: high level arena sphere rewards and raid sphere reward.