I don't remember Johnny, though I'm thinking he may have been a kid in the slums whose money you had the option to steal? Pretty sure that kid was looking up to his brother, wanting to grow up to be strong and brave like him or something. I could be sorely mistaken though

Palmer was an exec for Shinra and a sub-boss while getting Cid. He fights you while you're getting the broken air-plane. He's a fat useless tard

Reeve is (SPOILER)the man behind Cait Sith (the one controlling it [Cait Sith being a robot and all])