Great question — answering as the UphillTech team:
Typically a purple glow or purple fire (in anime) would indicate literal poison, especially in relation to food or a magical item, or a more metaphorical meaning, corresponding to emotions that would apply to someone who is feeling ' poisonous ' toward another characters. You do see this in the show on a number of occasions, especially when Gabe-chan is angry with her companions. That being said, what you're describing is literally the colour of Raphiel-chan's blouse top. In a slightly earlier scene, you can see that it's pinky/purple at the bottom, and then white at the top, and around the shoulders and neck. There's no 'magenta shadow' here, just an attempt to colour code the characters...
Full answer by Valorum: https://movies.stackexchange.com/a/131325 (CC BY-SA 4.0).
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