KSG-Chan Description - Basic Premise of Character-Design based off this image, though original art was not made to reflect personification of KSG Shotgun and creative liberties should be made, but this picture is a good reference.
https://i.gyazo.com/20720b03e7112efa8264b24cbded19bd.png

* Approximately 5'3" maybe upwards of 5'5" as she should be short as a her classification as a compact shotgun would describe. But not spectacularly short like you may expect from a Pistol or Sub-Machine Gun whom I would imagine to deeper in the loli spectrum than KSG is. 

* She has black hair fashioned into twin tails. Hair color is relative to the furniture color the KSG has. Tan Polymer = Blonde for example.
Reference image for twin-tails: https://i.gyazo.com/29998b0e77d7bdeb41b5735de6a13f2a.jpg

* Bust size is considered 'large' for her stature due to her capacity (14+1) which is high for a shotgun to begin with, much less a compact shotgun. They should not be ridiculously out of proportion however, just large for someone of her height.

* Eyes are at artist interpretation. If said KSG is fitted with optic, perhaps color of eyes would reflect color of optic lense. Red, Green for example.

Clothing - 

* Top would be a zip-open hoodie very similar to the image at beginning of this paste. I consider the pump assembly to be the 'top' and on the KSG it is two pieces that are screwed together, appropriately reflected in the selection of a zip-open hoodie. 

* Hoodie would be black. "KEL-TEC" embroidered on the breast, The back side and sleeves featuring waffle pattern printed on it with "KEL-TEC" centered on the back of the hoodie. There are two loops sewn onto the back of her hoodie under the Kel-Tec logo used to hold take-down pins. Like pictured feature:
https://i.gyazo.com/8b6ebe2e66a396c92093be4c62f3fade.png

* She wears shorts which symbolize the exterior of her buttstock/grip assembly. again close reference to source material but the shorts are black to reflect polymer coloration. Along the sides of either leg "COCOA, FLORIDA" is embroidered, the location of manufacture. 

* Panties represent interior of butt-stock where shell ramps are located. They're boy-shorts style which I think appropriately reflect the nature of a Combat Shotgun with Loli and Tsundere-characteristics (as obscure a concept as that is to begin with) again, boyshorts are black. 

* Shoes are of generic style with rubber soles with Kel-Tec waffle pattern on the bottoms, if it becomes relevant.

Personality traits - 

* KSG is a Tsundere at her core. The KSG shotgun is a new design by Kel-Tec, a company with some rocky quality control to start with. She has a temper, is prone to pouting, can be very clumsy and often at the worst possible times. She is high maintenance.

* She is very energetic, almost TomBoy-ish and capable of bursts of energy. However, she easily tires and takes time to recover, either napping or resting. This character trait is to reflect her capacity 14+1 shells which can be fired rapidly, but due to the unique loading process it takes a considerable amount of time to reload compared to a conventional shotgun. 

* Due to the fact the KSG can be prone to malfunctions, it can be reflected in her character that she wants attention, sometimes willing to break parts of herself, malfunction purposely or lie to get her owner to notice her.

Trivia - 

Favorite Food - Waffles