For me, cardinal tetras, dwarf gouramis, goldfish, danios, rasboras, angel fish, clown loaches, african cichlids, platy, molly and the list goes on and on and on...
pacus are what first come to mind.. never had a FH, or a JD, or RD.. always had tons at work to play with. I've kept alot of african lake cichlids... zebra danios i don't think I've ever intentionally kept. Gouramis... I really dislike them for some reason. Over the years I've honestly had a lil' bit of everything... The only one i can say 100% I've never had was a Pacu. just about everything else.. I may have had for some point. even if i got rid of it fairly fast.
Ive had almost everything accept gouramis and angelfish and those firetrack eels. I used to work at a Pet store so most of what they have as ive grown in this hobby is basic stuff.. I think most of you that havent tried AFricans cichlids should indeed make an attempt. Amazing personality and colors.