By default Chatterino is hardcoded to use the Fusion QT Style with a custom stylesheet enforcing a dark grey theme that doesn't integrate well with other QT apps.
These patches are based against Chatterino7 and tested with Chatterino2, though they should work with most Chatterino2 forks.
They're intended to force Chatterino to use your native system-wide QT Style and introduce minor quality-of-life tweaks to ensure consistency across various themes and color schemes.
Well, apart from wanting Chatterino to homogeneously blend-in with the rest of my desktop and have a uniform appearance; Some QT Styles like the Kvantum theming engine or Lightly support transparent windows. This allows us to easilly use transparency in Chatterino themes.
chatterino2-7tv-native-git is available in the Arch User Repository