Conversation so far:
What was Grigory Potemkin's personality like?
Potemkin "exuded both menace and welcome"; he was arrogant.
So he could be nice too?
demanding of his courtiers and very changeable in his moods but also fascinating, warm and kind.

Question: What did others have to say about his personality?
Self-contained rewrite: What did others have to say about Grigory Potemkin's personality?