Initially:
Frisk = Boy
Chara = Girl
 
Then, head canon:
Frisk = short for Franziska = Girl
Chara = short for Charles = Boy

And then, I remembered what was on Papyrus' room's door..."(NO GIRLS ALLOWED!)" "(NO BOYS ALLOWED!)" and "(PAPYRUS ALLOWED.)"
Frisk's gender is Papyrus.

Wait a second.
Alright, fixed the CS.
O)_(O

[img]http://41.media.tumblr.com/9c12a6df83e55a5b3bdd9b34b010b4e5/tumblr_inline_nxj7unNZUA1rqlr6j_500.png[/img]