Irenicus looks like a gym trainer who escaped a BDSM dungeon.
Lol. But then again, how else should a fantasy themed villain look ? Especially the one having a personal dungeon ? BDSM stays the timeless style of dungeon decoration, right ? (not really a fan of the futuristic apple and fascist/USSR art inspired style - of 'evil' aesthetics such as in star-wars) And personal development and leadership are surely qualities any good Evil villain who wishes to exercise some control over his subordinates and minions needs, no ? Btw, there's already a personal BDSM trainer near the entrance of the goblin ruins, so BDSM inspired evilness is def considered viable by Larian.
I'd personally wish they'd embraced some of those sweet Satanism references and metal imagery that gave WOTC products (MtG, DnD) their special subcultural flavour to teenage me (and just for triggering and trolling Christian parents associations) , but I guess satanism and extreme metal are not that trendy anymore .