Billionaire inventor. Scientist. Adam, Bree, Chase and Daniel's uncle, Tasha's husband, and Leo's stepfather. A brilliant but extremely vain man-child who allowed Adam, Bree and Chase to believe he was their father. Competitive. Brother of equally brilliant but sociopathic Douglas Davenport (true father/developer/originator of the bionic siblings). Openly takes credit for everything and shamelessly names things after himself. Perpetually hogs the limelight. Built the bionic academy after inheriting a lot of bionic teenagers from defeating evil bionic billionaire Victor Krane and brother Douglas. Occasional moments of warmth and wisdom when he can get over himself. Raised Adam, Bree and Chase to be bionic superheroes, which stepson Leo recognizes due to Donald's child-like qualities as resembling life-size action figures in display cases.