I did a Chell cosplay for AMA 2011.
I forced my sister to be my companion cube.
It was extremely fun xD We attracted a lot of attention (though she attracted a lot more than me by herself lol)
Pictures are on my profile. ^_^
ECCC 2015/Otakon 2015:
Monica Rambeau - Nextwave Version
Panne - Fire Emblem: Awakening
Lyn - Fire Emblem: Rekka no Ken
Palutena - Kid Icarus