User blog comment:GreekTelepath/EC Theories and Headcanons!/@comment-7342272-20141009195750/@comment-4698889-20141010101053

Check the Waltz manga illustrations: Kachess has indigo hair, Kyle has regular blue hair, while Gallerian has blue with just a hint of green (cerulean, I guess?) Also, it's not entirely possible that Gilbert had a sister that married into the Felix family.