Customization among an NPC would be pretty cool in my opinion. Imagine having an NPC that you think looks kind of boring or dull. With NPC customization you could change everything about that NPC. Physical Appearance: You can change its body type, hair (Color/Style/Facial Hair), facial expressions and even its stance. Wanna give your NPC a mohawk? GO AHEAD! Want it to be big tough and buff, or fat weak and hunched over? Sure! Mental Attributes: You can change the way they think, think things through, handle situations and the way they interact with others. For example: You want your NPC to be tough, mean, fearless and cocky... well no problem! If you want them to be timid, scared, helpless and f***ing dumb as hell, well you can do it! (The way they think helps on how they maneuver around when fighting or just walking around.) Combat Style: I like this part a lot. You can change the way they fight! For example: Your NPC fights with gun type weapons... well you could change that! You could make it so it fights with swords, maces, bows, daggers, or Teck type weapons (I spelled Tech like Teck for a reason. Teck Weapons are the "new" magic type weapons which were used in Terraria, instead of using "magic" you use "Teck". Teck is the electrical power you currently have. There will be a Teck Bar by your Health bar.) You can also make it so it can fight by jumping and shooting or running, dodging and shooting/slashing/stabbing etc or whatever! You decide how it fights. Accessories: You can choose what your NPC wears! Want to give it a cool black trenchcoat like Blade's? Ok then. Want to give it a hat? Awesome. The possibilities are endless when it comes to the customization, you can even change the color of the clothes. Hell, you can even draw your own items for you AND your NPC's with the "Static Animation Processor" (Machine you can build later on with the right resources and parts and right NPC) With the S.A.P. you can (Similar to MS Paint) make your own clothes and items (Yes even weapons) for you AND your NPC's. I hope you enjoyed my suggestion guys! Send me some feedback!