I started my FOWLR with a clown, a Bangaii Cardinal and a blue damsel. I still have them 3 years later. (Well diff clown actually). I also added a Coral Beauty angel early on and he hasn't touched any corals yet. Damsels can be a bit dominant and nearly impossible to catch if you need to QT the fish or move the tank (as I have found out twice). I would recommend a clown, bangaii Cardinal, blenny or goby (although some can make a mess of your substrate and tunnel under rocks, so chose wisely). I also have a yellow assessor now who is quiet and peaceful.
There are so many choices, just research them well and chose tankmates that are reef safe so you can get corals in the future.