I also think the boat used by Tyrion (the lion) and Moqorro (the black flame) is a pretty safe interpretation. But in his POVs Barristan outright defines Reznak as "the perfumed seneschal", so maybe that one presents a danger that has not happened yet. I also wondered if the description could not apply to Varys in a sense, since he is always powedered and perfumed, and has been working in court for so long, but I admit it's a stretch. However, there is a notable discrepancy in that prophecy, namely that Griff and YG (probably the "mummer's dragon") ended up going to Westeros instead of going forth to Meereen. I'm not sure what to make of that, except concluding that Quaithe's warning only concerned one possible future.
