I think the real reason Iruma's imagined things - Fluffego, the sakura, mana-eater Ali, the piano - tend to be fluffy isn't (just) because Iruma himself is supposed to read as gentle and harmless.
I think it's sourced from the exact same thing as his Overwhelming Crisis Evasion skill: a lifetime of hardship, fear, and pain. Iruma brings fluffy, soft ideas to life because those things aren't a threat.
(side note and late spoilers:)
Some people keep saying Merize looks like Iruma but I don't think it's supposed to be because they're related, I think it's because humans are meant to be 'softer' than demons. Clara and Sullivan probably aren't physically reducing to near-chibi (although that's hard to be sure), Purson probably has more detailed features than we see - this is a style thing, meant to impart a particular impression. Iruma in his 'evil phase's don't seem to draw a "hey you look different" so much as a "hey you're acting weird", so his features probably aren't as sharp/sharper than drawn, it's just a representation of the change.
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