well for the people that knows something about kingdom hearts 2 this guys axel and saix have special powers axel can control fire and saix gaot his strength by the moon right so in kingdom hearts 2 final mix they said they know each other for a long time but they dont know how.

like every player of kh 2 know all people of organization 13 are nobodies that mean that they lose their heart and the body but somehow people with a strong bodie (spiritual) can stay with a bodie similar to his past body.

so here is the thing in their past lifes axel and saix were twins named lea(axel) saix(isa) that have the same powers but they still saying they know each other for a long time and i discover this who are the twin greek gods that control the sun and the moon........ i leave that to you and if you dont know wow how can somebody wont know it
apollo and artemisa
isa and lea
saix and axel