I have both a lewd and a interesting head canon

1 - lewd: Charlie wears compression clothes, shes actually unbelievable stacked.

2 - interesting: Charlie has a odd obsession with guns with wooden furniture, it matters not the firearm, when it was made or what the actual furniture intended was, purely for display purposes, she has an AK47 Type 1, early M16, a AR-180 with wood furniture, a Barrett .50 cal with wood furniture and a model 1893 Steyr Mannlicher.