Oh, finally... It only works if I create a new profile, it looks nicer with transparency, however the font selection is very limited ( it doesn't accept all fonts )
You should give https://www.nerdfonts.com/ a look. There is a patched version of Fira Code and it's pretty damn fancy, although there are plenty alternatives and instructions for creating your own if you fell like it.
Yeah, i stumbled upon this website yesterday when I made the comment, from the first glance it looks like a huge project, I'll will look into it deeply, thnks for sharing
I think for transparency in Plasma you use "Window Rules", a tab in which you can specify a lot of stuff, like opacity, and you can confine your settings to certain programs, certain categories of programs, all programs, etc. There's really a huge customisation potential with Plasma!