There was dialogue in Clayman's section?! All I saw was the demon lord of thigh gaps, Frey.

Guy and Leon also don't really act like I expected them to, from their backstories. Guy is the demon lord who stopped Milim's initial rampage. Leon summoned Shizu and tortured her with Ifrit. Yet they both kind of act like idiots. Guy is very much a 90s shonen anime type...guy. Cromwell is apparently more of a gray type of demon lord, rather than pure evil. Serious, but not malicious.

Guy being voiced by Ishida Akira (Xellos, that douchebag clown from Soul Hunter, and countless other shady villains and non-villains) is of course the most fitting actor for him. And Fukuyama Jun for Cromwell.

Yeah, it kinda sucks that they are already de-escalating the tension of Walpurgis. Everyone hates Clayman, everyone wants to see his comeuppance, nobody is going to defend him. It's pretty much set up to be Rimuru's victory, with only Milim being a problem, and they've already completely explained why she's turned her back on Rimuru and did what she did.