In your opinion, which hero has the most charisma in the campaign?

Biara personally killed Tieru. And what does Jezebeth have to do with it, I mean Isabel? And did anyone, besides the four "heroes," see the Overlord? No one. But everyone was still afraid of him. And where does it say that Biara started acting on her own? Everything came from one mind, everything Shiio did was at his direction. Except for Agrael, of course. Charisma comes either from respect or from fear.

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And why is the Overlord an ugly creature? He's just like Sauron.