Hi! Well thanks very much, its fun to be here. And you must be telepathic, because I'm already contemplating a second character... I'm thinking a Corner, possibly a Slytherin.
Gideon! Well, I have written into my bio (and a letter) that apparently, Edgar's mother is quite fond of the Prewetts, and by extension Edgar. His crush on Molly isn't well known, because while Edgar can be quite charming and kind, he is the shy type with intimacy. But brothers are crafty... he could have noticed Edgar's fleeting glances at Molly's face and the small smiles that result. You're welcome to interpret as you wish!
As for Gid's combativeness, Edgar would probably try to talk him out of it as they became friends, and would probably eyeroll and cross his arms when Gid got into a scrap. And then dutifully, as a friend, help clean up the ensuing mess. Edgar is a person that resorts to violence last, but acts decisively when in combat.
Hana sounds cute! They would definitely know of each other. Maybe they have a good friendship going based on politics and history and some friendly verbal sparring. She could try to put hats on him- probably to his distaste but hey! They might have gone to some dances together too!
Well, when Emmy and Edgar fully understand their polarities, yes. They will be enemies. Edgar hasn't come out as a Muggle-loving, Purist hating anti-Voldemortist just yet. But he's getting there. They could have a strained, forced sort of interaction where they are compelled to mingle. Maybe they even like one another until someone says the wrong thing.
Ah! Natalie. Edgar is one of your best students. He's a serious boy who takes his work in DADA unusually seriously. And she may have heard that Edgar is a quiet but attentive boy in class who doesn't offer much. In DADA, he is different. He speaks up and volunteers often.