The Silver Age is the only period where Wonder Woman had a great supporting cast with Wondergirl, Wondertot, Bird Boy and Fish Boy. Wondergirl is just a great character and her stories are some of the greatest WW issues ever. Bird Boy and Fish Boy are pretty funny too. Too bad Kanigher had to kill them all off because of 'continuity.'
FYI, Donna Troy and Cassandra Cain aren't actually WW characters and they (likely) never will be. They weren't introduced in a WW comic and they barely ever show up in WW comics