I haven't even got my x-t20 yet and I'm buying accessories!
I bought the XF 18-55mm kit. I've already bought...
XF 27mm pancake lens
Dual USB charger and a 3m long USB 2.0 micro b cable
Thumb rest
Remote shutter release
I'm planning to get two extra Fuji branded batteries, a lightweight tripod, toploader camera bag and a hand grip too.
What non-OEM accessories have you bought for your X-T20; please post photo and link if you don't mind.