Firestorm and E-Man

I remember being surprised when the relatively new hero Firestorm was allowed to join the Justice League of America.  He was a welcome addition though - I really liked his interactions with other members of the team.  Superman acted as a mentor, and The Flash would get annoyed by his inexperience.  There was even a spark of romance with him and Power Girl during the JLA/JSA crossovers, I always hoped that would have gone somewhere.