It is of my opinion that House Blackfyre is going to be making a comeback in the person of
Aegon VI
Now, all the major houses have their words. Starks are "Winter is coming", Martell's words are "Unbowed, unbent, unbroken," and those of House Targaryen are "Fire and Blood." I assume these are just phrases that people of these houses say when going into battle and the such. Even Bittersteel, one of the Great Bastards of Aegon IV, had a semi-house words phrase said before battle: "beneath the gold, the bitter steel," which was adopted by the Golden Company as their battle cry.
Logically, this is a Westerosi custom and I find it likely that every house has its own words. Therefore, what are the words of House Blackfyre, one of the most important houses in recent Westerosi history? Is there any hint as to what they are, or can I just assume for all purposes that Daemon adopted the words of House Targaryen?
When Maelys the Monstrous died upon the Stepstones, it was the end of the male line of House Blackfyre.