To be honest, I didn't know anything about this Ertha, even when back in the Sins Paradise game.
When Sana told me about her, she mentioned her name and rank as a Bishop. Her appearance, face, age, hair color, and the others were still a mystery to me. Especially when Sana said she trusted this one to the point of leaving her with the command of a church.
But because the characters in Sins Paradise were too many to count, I probably just forgot about one or many characters.
Not all of them had a different disposition. Most of them were plain, only strong at one point, and didn't appear again in the late game.
"H-Hello! I-It's nice to meet you!"
Some characters had something that made them stand out. For example, Sana with her skimpy and erotic outfit; Rania with her masochistic tendency: Emilia with her high sexual drive; and Eliza with her tsundere behavior.
"My name is Ertha Castitas!"
What is holy body? It's still a mystery!
You can guess, though, but who would've thought Ertha would be half-angel?!