There are a lot of people in the FFXIV RP community, many playing multiple characters or who have rerolled/retconned with entirely new concepts in the past, and they are all across the board in terms of character archetypes. It will be difficult to make any sort of character who doesn't have basic similarities with at least a few other characters, and I don't recommend striving for that for a few reasons. The good thing is that at least on a server with a smaller RP community like Famfrit, you will probably run into fewer similar characters.
Otherwise, there are way too many tropes to list them all and little point in listing them because, well... they are all subjective, albeit some more subjective than others. Tropes are not inherently bad things. Everyone will have differing opinions on whether tropes in general are good or bad, what tropes exist, and which of those tropes are "okay" to RP. Just have your own fun and make the character you want to make, and don't let anyone else define the tropes you want to avoid or embrace, just use your own judgment and preferences!
Otherwise, there are way too many tropes to list them all and little point in listing them because, well... they are all subjective, albeit some more subjective than others. Tropes are not inherently bad things. Everyone will have differing opinions on whether tropes in general are good or bad, what tropes exist, and which of those tropes are "okay" to RP. Just have your own fun and make the character you want to make, and don't let anyone else define the tropes you want to avoid or embrace, just use your own judgment and preferences!