https://www.raspberrypi.org/magpi/raspberry-pi-3-specs-benchmarks/ which is like half a decent computer nowadays
https://www.raspberrypi.org/help/faqs/#powerReqs
typical use of 400 mA, power bank should be sufficient.
10,000 mAh means that it can be used for.. 25 hours? which is pretty good
https://www.adafruit.com/product/1601
this connects to the spi pins, leaving the gpio pins empty implying that we can still use the gpio pins for a console (if any)
and it's touchscreen... which makes it possible to skip the console / buttons or use a keyboard. there are 4xusb 2.0 ports
https://www.pi-supply.com/product/papirus-epaper-eink-screen-hat-for-raspberry-pi/ e-ink sounds neat but also q expensive 2.0" screen for medium https://shop.pimoroni.com/collections/displays/products/adafruit-1-8-18-bit-color-tft-shield-w-microsd-and-joystick
this comes with joystick it doesn't get easier but the link doesn't give details on the joystick "5-way navigation stick" 1.8" screen https://www.adafruit.com/products/2315 no touchscreen version 2.2" screen
https://github.com/notro/fbtft/wiki/Raspberry-Pi-Display-shield-comparison