golden trio? I think you mean silver triad. ginny sharing defense against the dark arts notes and kisses with luna and neville. luna and neville cheering for her during quidditch matches loudly enough for the entirety of gryffindor house. luna sewing them both really odd clothes that they’re kind of off-put by but which they wear anyway bc luna made them (and ron makes fun of them all the time but he’ll hit anyone else who tries to)
polyamorous luna neville and ginny generally being cute and important. I think that’s what you were really looking for.