(spoilers)
(6)Oliver Wood
(11)Dean Thomas
OMG apathy.
Ok, think, mc, think. I may not care about them, but what do I even know about these two characters?
Oliver Wood: Captain of the Gryffindor Quidditch team. Keeper. Drives his team hard; they think he's crazy. There's a memorable comment someone makes about asking if Oliver Wood died, because Angelina seemed to be "channeling him". His shining moment is when McGonigal goes seeking "Wood" and Harry misinterprets what she means....
Dean Thomas, thinks he's muggle-born but actually isn't (his mother had a one-night stand with a Wizard). He's the boy with posters of a soccer team (West Ham, I believe) where Ron's all like "wtf, the people in this picture don't move". He dated Ginny for a while; Ginny making out with Dean actually got Harry jealous and wanting to kill Dean. Speaking of, he was on the Gryffindor Quidditch team briefly himself, which spurred cries of conflict of interest for Harry, picking too many kids from his year. Not to mention seriously upsetting Seamus, who was the Quidditch fanatic growing up. Oh, and he meets up with Griphook and that other guy and go camping together in book 7.
Ok, yeah, I've got about twice as much to say on Dean.
(3)Kingsley Shacklebolt
(14)Mundungus Fletcher
It feels like Dung has like...10 times as much screen time. That's probably an exaggeration, because I think Kingsley is in a lot of scenes where he just fades into the background as "another token Order of the Phoenix" member. But Dung and Tonks are the two people Harry meets through the Order who actually have significant amounts of characterization and manage to stand out from the group.
(7)Sybill Patricia Trelawney
(10)James Sirius Potter
Epilogue character.
(2)Buckbeak
(15)Bathilda Bagshot
This woman has scary connections. Like...she knows Lilly Potter well enough to chat with her and tell her that Albus used to be friends with Gellert Grindelwald. Not to mention being related to Grinelwald, and as I recall the one person in whom the Dumbledore family had some friendship with despite being a quite secretive family.
Buckbeak attacks Malfoy, and escapes being killed and...yeah, that's about it.
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Cats land on their feet. Toast lands peanut butter side down. A cat with toast strapped to its back will hover above the ground in a state of quantum indecision