Perospero is underrated in terms of kindness. In the middle of the Tea Party's opening, he was still thinking of hungry children who wanted to eat the candy.
Perospero SHOULD HAVE killed Carrot and Wanda, but left them alive because he realized they were fighting out of loyalty, and that Carrot was young and blaming him when Pedro was the one who blew himself up.
Perospero is honestly one of the most complicated characters in the series. He can be cruel, but, as far as pirates go, he's actually very kind, and rational. Still wish we had seen a bit of Marco/Perospero double trouble action in Onigashima.