i think blademaster would be a no-nonsense "obviously this guy's history is as a war-hardened military general" kind of guy, so not like the Worst in terms of loopy sadists among the apostles but still a harsh contrast to mamoru's general warm/kind niisan aura. he might smile occasionally but just for a mocking reason (especially towards ibuki/The Messiah's Vanguard), and otherwise keeps a stoic/angered expression. i honestly think a mamoru who simply loses all his warmth is jarring enough that there's no need for further theatrics like how valeos or chaos breaker are. he just has a mission and won't stop until it's done