Mo Sanford - I was a little kid when he came up and I just thought he was going to be incredible.
Marc Kroon - same as above.
Ron Robinson - he started the first game I ever saw in Riverfront. I think I was 6. Lo and behold, we happened to be sitting right next to his brother, who looked exactly like him. He was very nice. Had a 1985 Topps card of Ron's on his person that was autographed and he gave it to me - still have it to this day.
Tim Birtsas. The quintessential huge, soft-tossing lefty. One of my all-time faves.
Just a few who weren't mentioned that popped into my head. Fun topic.