James | YAY Lucky him, Harry is not from a time displacement game soooo confusion and disbelief galore! lol. I can't really think of anyone else in my roster that would know him.
Ted | Harry would know of him, but mostly as Tonk's dad and Teddy's grandpa. He'll be nice, cause he's Harry. The rest of them don't know him and don't have a reason to hate him sooo we're good.
Hermione | You have all the characters for Harry and none for anyone else. I see how it is. BFF's obviously. He'll be weirded out that they're older than him. lol. And he may or may not risk calling her old.
Zach | Harry also knows him ... not that he wants to know him, but there you have it. He's more likely to just ignore him. Let's be honest. I think maybe Lexi might enjoy Zachs sassy attitude. The rest of them could go either way.