I found kassadin's daughter
 

Since Syndra is confirmed not to be Kass' daugther, I think that means there's only one person left who could be her.

http://forums.heroesofnewerth.com/sh...ser-Riftwalker


Malzahar teleported Kassadin's daughter to the Void, a dark and terrible place full of monsters, trolls and dark evil stuff, basically HoN. Let's hope Kass' daughter can riftwalk as soon as she can out of that terrible, terrible place.

She actually does look alot like a female Malzahar, isn't that his coat?

Actually, it looks more like if Malz railed Talon.

That's talon's cloak right there.

In space, nobody needs pants.

Magic.

LIES! We all know that after being exposed to the Void, Kassadin's daughter transformed into what we know as Kog'Maw.

OMG SO TRUE!!!
Really, how could I miss that?
Riot needs to make a pre-void Kog'Maw skin now :3

I believe I was the first person who brought up this possibility a couple months back.
However as another pointed out to me, Kog'Maw joined the League BEFORE Kassadin's Daughter was lost to the void. However, the function of time and reality is probably nonexistant or very distorted in the Void.
Also, the lore stats Kog is male but.... the void is messed up so yeah....
Kog'Maw is very childish and young in nature, and we can thus assume Kassadin's Daughter was too.
It is an unconfirmed albeit possible possibility.