Since I see no replies yet, I'll give a sort of answer. I use Overseerr and my own self hosted domain name with Cloudns so that I can let my friends/family connect to it remotely to request stuff.
It sounds like it's definitely not 1:1 with what you're asking for since it only does sonarr and radarr and is not something accessible from messengers, but figured I'd mention it because it's been great for me. I use it for myself to add new stuff as well so I never have to go into the individual sonarr/radarr instances to add stuff.
I definitely recommend picking up trade paperbacks instead of individual issues if you don't want to worry about continuity. They usually all have what you're looking for: a self contained story line where you just need to know the basics of the character.
I highly recommend the various Spider-verse storylines, personally.
Also many issues and trades will have narrator boxes explaining the gist of what you need to know to have context from past issues you may not have read, almost always citing the exact issue if you're curious (obviously that probably helps with sales too).
The Nick Spencer run of Spider-Man was excellent, IMO, and has some amazing art to accompany it with some absolutely top notch two page spreads to boot.
That Linux command line book is really, really good. I love how it actually explains the commands and why to use them instead of just being a copy of each commands help document or something.
Congrats on ditching Windows!
For sure. I use it on my home servers and love it.
Debian is a fine distro, but it's main strategy is being "the stable distro". So most software packages are at least a little out of date because they only put the most stable and tested versions of software in their default repos. You can add other repos to get around this if you want the latest and greatest, but most other repos keep their main package list more up to date.
Debian is fantastic if you want to set up a quick and easy home server due to it's long and solid history, huge user base, simplicity and stability.
Highly recommend Linux Mint, Ubuntu or Fedora for your main desktop distro when coming from Windows. They have an extremely wide user base, huge list of easily installed and compatible software (like, search for it in the built in software center app and one click download and install it, instead of having to use the command line or build from source), and will definitely be the easiest to triage issues in/find answers online for.
One big consideration is driver support. Yes you should be able to set up all drivers you need on basically any Linux distro, but the three above basically are designed to do it for you, including the proprietary drivers needed for certain web content with annoying DRM, and for NVidia graphics cards. There is an open source driver for NVidia, but my understanding is that the proprietary one has way better compatibility and performance (this is purely hearsay, as I have an AMD card, so I'm not speaking from experience).
Others have mentioned the things about SteamOS being made for the one specific handheld, which is true. It boots straight into the gaming handheld mode by default, so if you wanted to see the desktop you'd have to load that, then go to the menu and select "switch to desktop mode" every time you boot.
Plus you can just get that exact same gaming mode UI on any desktop with steam installed by going into the menu and selecting it or hitting the home/Xbox/PlayStation button on a connected controller when steam is open.
Unfortunately not in my setup, but that's just because I don't have the money to upgrade it at the moment and nearly everything I have is stuff I can easily redownload.
Once I can save up for it I will up my storage and get some back ups set up.
As far as move sets go, you could always base them on things about the animal for animal based mascots. Like an ice slide for Tux, a charge for the GNU mascot, a long distance tongue grab for the KDE mascot, etc.
Also, as far as characters go, you could always include any public domain characters, like Frankenstein's Monster, Dracula, Steamboat Willie, Winnie the Pooh, etc.
Like others in here, I also set mine up with Debian and docker compose. Since it's an always on server I wanted maximum stability. I don't use unRAID, so not sure about compatibility for that.