Before the She-Ra toon came out on DVD, I was not familiar with Castaspella at all. Watching those episodes for the first time is what first drew me to the character. I don't remember her being portrayed as "flighty" at all in the series. In fact, I believe she was portrayed as an older and wiser member of the Great Rebellion, along the lines of Queen Angella. I remember her being one of the more powerful members as well, and I believe she was a queen or leader of a kingdom as well. I'm not sure how she was portrayed in the minicomics.
I've always liked her design, and she is my favorite vintage POP figure, even though they used the orange and yellow color scheme as opposed to blue and yellow. I feel like if a new cartoon was made for She-Ra, she'd be shown as very powerful witch, probably to the level of Shadow Weaver, and would be Weaver's main foil. To me, she's always been one of She-Ra's most valuable allies. I love the lightning theme of her outfit as well as her hair style and the blue-and-yellow color scheme. Basically she just rocks in my opinion