First few search results, something from the first few options in that page, but no mention of "console" or "terminal". Maybe because very few users use them - fine. So, let's try:
https://www.gnome-look.org/p/1199683/
Downloaded the version "3-2.8" tar.gz file of the options in that page. Extracted it to ~/.gimp/themes/. It did not show as option in Gimp - had to reload Gimp for that.
But the theme worked! Now the console uses the same colors as (the rest of the Gimp's windows, which is a bit different from my normal windows... but i can live with that).
Now, the theme changed many other things. I thought about making a minimal theme which would JUST the terminal colors. I opened the gtkrc of the theme and searched for "console", and for "terminal" case insensitively. No result. Since ondoho said his Gimp is normal, i tried to search for those words in the Default theme, system wide. Surprisingly, it is a much smaller text file, but also no result.
About a theme: How do i discover, without silly trial and error, what in it changes the console colors? If you know the answer, please say it too.
Meta-comment: at this point, I am unsure of what to do with the thread. Mark as solved? Or let it as is, until this post question is answered too (which is my choice)?