Hello! Thank you so much for your interest! We will be having add-ons available on backer kit for purchase! You should be able to add on the items that you want at that time when the backer kit survey is sent out!
Great question! Kickstarter will only allow you to add physical add-ons to tiers that offer physical items. Our lowest physical tier is Shattered Souls Squad [Physical]. This will allow you to purchase available physical add-ons. The stickers and Kit Pillow plush are not yet available as add-ons. We are considering adding them as a special addition to the backer kit survey (for those interested).