Character and Performance Vin Diesel’s Riddick is an economy of acting choices: minimal dialogue, a cold but charismatic presence, and physicality that communicates as much as words do. Diesel owns the role; Riddick remains compelling because he’s defined by contours — the rules he lives by, the predator instincts, and a private moral code. Supporting performances vary. Thandie Newton and Judi Dench provide gravitas in different keys — Dench as a hardened commander, Newton as a conflicted ally — while Colm Feore’s Lord Marshal offers an imposing, quasi-messianic adversary. Some characters, however, function mainly as archetypes or plot devices rather than fully realized individuals, an effect of the film’s appetite for spectacle over intimacy.