Show I saw in 2018

I saw some show in 2018 and I'm dying to know what it is. I saw it in Switzerland, it was in French. I can't remember if there were subtitles. I only remember 3 of the 4 main characters. One was a girl with pink hair. Another was a boy and his sister, and his sister carried around a blue bear. I also remember there was this woman (who I assume is the villain) who could turn invisible or something like that. Anime-ish art style. Thanks!