@plastram: when i find a good animation i will

@erolok found a better way:

you need a .webm video file and it cant be too long about 12 seconds works great for me

you can cut the video and change it to .webm with FoneLab Video Converter Ultimate. its free and easy to use
https://download.fonelab.com/video-converter-ultimate.exe

create a poster.jpeg by screenshotting the first frame of the loop (it has no effect on the wallpaper but thats what you see where you choose your wallpaper)

open text editor and copy the following in (fill in the stars):

[Info]
name = *****
author = *****
version = 2

[Start Page]
background = video.webm
position = center bottom
title text color = #FFFFFF
title text shadow = none
first frame image=poster.jpeg

[Web UI Pages]
background = poster.jpeg
position = center bottom

save the file as persona.ini

create a .zip archive and drop in the video.webm poster.jpeg and persona.ini

open opera and open the link opera:about there you see where your themes are saved
C:\Users\name\AppData\Roaming\Opera Software\Opera GX Stable\themes

drop the .zip in this path and then restart your browser

now open settings and you should see your wallpaper in your installed wallpapers

@tride: will update it tomorrow found a better way to do it
Probaply about 5-6 pm european time

@samu69: death sworn kata looks cool i will look if i can do it
Will take probaply a week or two for Opera to release it tho
If i remember i will tell you when its released

@tride: i dont create the animation my self but if you have a animated video for it you can maybe do it on your own and dont really know how you want it
I made a easy to do list for this
https://forums.opera.com/topic/50430/create-own-custom-animated-wallpaper-easy?_=1630384009673
Just download the file and follow what the text document says

If someone has a wish for a wallpaper just comment what character i should do next

If someone has a wish for a wallpaper just comment what character i should do next

I made a folder with that you can easy create an custom wallpaper and a text how to is also in the folder.
just download it and safe it anywhere on your pc

Open the ffmpe folder and then the bin there you see the how to
i used example paths just change it with your path

https://drive.google.com/drive/folders/1ek0slgajJJaojIpKaRK1kQ15Swu_Fo6x?usp=sharing