I've been using HelixNotes and syncing between my devices via git pull/push on a private codeberg repo, but if you're not familiar with git then syncthing and syncthing-android (assuming you have android) should work as well.
I absolutely love HelixNotes so far (been using it for a month or so).
Yeah this is great. KDE has had Konqi and Katie forever. I like that Firefox is getting it's own mascot as well.