Ple-Sen
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I don't remember the vampire lady.
The samurai girl, I think, only appeared in Lapistia's opening post.
The knight in plate armor — that's Ludovic Alvarez. Consider him a predecessor of the Tiari and Eugene lines. He's known for wanting to live forever, sleeping with his own daughter, and being destined to cut off the head of a Heroes champion, according to a prophecy.
The Sorceress, I believe, was mentioned as the strongest in the setting, but I don't recall her appearing all that often. I remember the name, but that's about it.
The white-haired one — the queen of the succubi, who ran a city with a casino and brothels.