Board Thread:General Discussion/@comment-5501448-20161104194735/@comment-29189890-20161128222028

The most likely cannon reason is because a celestial sapien decided it should be so, an explaination for most all aesthetic alterations throughout Ben 10. However, it is arguable that it was blue before she was tapping into her Anodite mana. Meaning she was tapping into her Anodite mana before she knew she was an Anodite. Or mana color depicts the quality of mana in general.