A band of four adventurers had set out on a journey to earn fame and fortune, and generally find their place in the world. On their travels, they come across an abandoned castle, lost to time, and seemingly untouched by nature as if by magic; no overgrowth taking over major parts of the buildings, no kobold or goblin squatters claiming the place as their own, not even a rat. At least not that they could tell, but if there was one, the Elven thief Iris would probably have found out and shreaked. Loudly.
After a rough comb-through of the castle, the adventurers sat down around the table of a dining hall and discussed their findings. "Well it's definitely empty, not a soul has touched this place in probably a good two thousand years" declared the pink haired Elf named Maria.
"And you mean that literally too, there's neither living nor undead to be found here, save for ourselves." The Half-Orc Ithelis stated. And he should know, he was a Cleric.
"And the treasure vaults have long been emptied, so this place is pretty much worthless." Said Iris.
"Well... maybe not that worthless." Spoke the large Human Angelo.
Curious at his statement, Iris challenged it. "How is it not? There's nobody here, there's no treasure, we should just put this place behind us and call it a day."
That's when Angelo presented an interesting suggestion. "We're the only ones here right? Why don't we claim it as our own and make a home out of this place?"
Everyone paused for a moment and thought about this. Maria spoke in agreement to the idea. "It WOULD be nice to have somewhere to call home and return to between adventures."

Angelo proceeded to name the castle. "We'll call it Fort Kickass!"
Nobody had any better suggestions.