Relative Error would be somewhat the inverse of, but definitely comparable to, this trope.
Platonic Life Partners is a sub-trope in which the characters are not only close, but their relationship is the primary one in their lives.
If you can imagine the same-sex versions of the characters being Heterosexual Life-Partners, then they belong under Platonic Life Partners.
They are like my brothers.” She added: “Dan and I could sort of have a laugh about it. The epilogue to Harry Potter and the Deathly Hallows – Part 2 (SPOILER ALERT if you’ve made it this far without seeing the end of the movie or reading J. Rowling’s books) shows us an older Harry (Daniel Radcliffe) and Ginny (Bonnie Wright) sending their son off to Hogwarts.During an interview with The Huffington Post – an outlet that sounds like it could also be a news service in the wizarding world of Harry Potter -- Grint was asked where his character might be today.And instead of painting a rainbow of hope, he steered toward despair.Sometimes, two characters of the opposite sex are very close—so close that you might expect them to be dating. They admit that they matter a great deal to each other, that they would die for each other, that they can't imagine life without each other. No matter how other people view them, they can't see each other in that light.
The couple are at pains to explain that their love is completely platonic with no sexual attraction on either side.They had to spark a reaction out of Ron, played by Rupert Grint, who's in love with Hermione.Dan might have loved it, but it sounds like Emma was trying to keep the kissing down to a minimum.Many men would lose a limb to be in that position, so I was absolutely fine with it!" But as those of you fans know, this had nothing to do with their characters Harry and Hermione hooking up.Like, ‘Oh my God.’ I can’t really remember anything apart from that.” And the duo didn’t bother to practice the highly-anticipated moment. It was such a huge moment and there was so much expectation.