User blog comment:Sirenixisthebest03501/I think I found out!/@comment-4954276-20140523214504/@comment-8796478-20140524050140

In Stella's case: This was proven by Musa and Flora when they told her that she acts like a 3 year-old.

In Aisha's case: This was proven by Stella in Broken Dreams that why does Aisha acts so bossy?

In Tecna's case: This was proven by Stella in Sirenix Book when she asked Tecna why Tecna is too technical. She need logical and reasonable proofs even though they are in a magical world and everything's possible.

I don't have fixed proofs for Musa and Flora.