I don't think he had a strong personality. He seemed to just be led into things: becoming the heir to the Romanian throne, marrying Missy, etc. SO overshadowed by Missy that he kind of fades into the background of history.
He was way more sexual than Missy, and had a number of affairs. I don't think he was a particularly involved parent. He had a difficult time standing up to advisors and the King. Probably to Missy, too.
But I think he was duty-oriented and it was utterly appalling to him when Carol turned out the way he did...didn't quite know what to do.