We also know that she appears to have gained a body out of absolutely nowhere when she was born from the separation of Sora's body and Kairi's heart, and is a blonde for no apparent reason.
She's Kairi's Nobody but her birth was possible due to Sora, she came from Sora, and has links to Sora's Memories. She's basically Kairi's Nobody in face alone when you look at that.
So yeah. If Roxas is blonde due to Ven, Namine would be too.
Isn't it possible that there might be more of a connection between these two than we've given thought to?
She's Vanitas purified by Ven and Kairi's Light.
I guess Kairi assimilated Ven's body and soul.
To play devil's advocate, there -was- a blank time we know nothing about between Riku saving Namine and Kairi and us seeing Namine once again as a
translucent entity and -
then- we saw her get absorbed into Kairi.
It's happened before that Bodies disappeared only to reappear elsewhere. It's not completely impossible if the "fade out" Namine was experiencing when they ran into Saix wasn't -just- Namine herself being absorbed into Kairi, but her vessel - being Ven's - returning to Castle Oblivion.
WHY it would return there is the more interesting question seeing how I doubt Ven's Heart was still there.
Mayhap a Lingering Sentiment? Do ho.
And a point this made me ponder.
Vanitas. He was a part of Ven's Heart, right? And, eh. His vessel was... *trollface*?
Maybe Namine's something like that.
Screw this my "Namine is Vanitas" mock comment made sense. */wrist*