I use the TV remote control for the basic stuff. If I need to type something longer or more options, than I switch to Kore (official Kodi remote by the same developers). You just need the phone to be in the same network.

Never felt the need to connect keyboard+mouse.

I’m running a RPI4 with LibreELEC + Kodi.

YouTube runs better than the official app, at least for my needs.

LibreELEC + Kodi works out of the box with the TV Remote. And you can use Kore (android app) to get a full keyboard.

I’m just going to leave this and this here.

Never touched heroic launcher so can’t really help you there. Normally I just use Lutris, works without fail every time.

https://lutris.net/games/elden-ring/

Can you change the runner in heroic launcher? Like proton instead of wine?

It does. 😉

Does it support comics?

Glad to have helped!

I’m not experienced with nvidia shield, but in my raspberry pi I use Kodi with the Daddy Live addon. I believe you can install Kodi in the shield, so maybe that’s an option.