>>81
Some possible explanations for Jeanne being a blonde bombshell are -

• In the Nasuverse: Jeanne was first planned as a character for Fate/Apocrypha back when it was an MMO project that later got aborted. In the Fate/Apocrypha novels that got written later, she manifested by possessing some random French chick from modern times named Leticia and in doing so assumed her appearance. Who knows if this was part of the original MMO story, but it gave them a plausible excuse to change her look.

In Fate/Zero Gilles de Rais mistakes Saber for Jeanne, and so Takeuchi may have wanted to make her look similar enough to Saber that this wasn't literally insane (not that he isn't.) She has the "Saberface" trait in FGO.

• In Japanese shit in general: I think Jeanne's first depiction in a video game was as Janne D'arc in World Heroes from 1992. This may have started the trend. Or maybe some random fucking manga or anime I've never heard of did, though none of the ones listed on the Japanese Wikipedia that predate World Heroes look like they were very popular.

It could also be Ingrid Bergman's fault, though that doesn't explain the long hair.