Default Language Style
Where are the default language styles from? eg python
Do the styles have any relationship to https://pygments.org/styles/?
The colors chosen for Python lexer/syntax highlighting can be found in Settings > Style Configurator, and selecting Python from the language choices. The default colors in the default theme were somehow chosen by the developers in ages past; the colors defined in other themes were chosen by the theme creators.
The code that handles parsing the Python text and deciding which characters to color with each style are compiled as part of the Notepad++ application, and cannot be changed without re-building Notepad++ from source