Lunaria. The name makes one think of something related to the moon, maybe a kingdom that has a special connection to lunar cycles, like its magic being stronger during a full moon or its architecture being built to honor the moon.
Avalon. It has a mysterious and magical feel, often associated with Arthurian legends. It gives the impression of a place full of wonder and adventure.
One way is to combine words from different languages. For example, use a Latin root word like 'Regnum' which means kingdom and combine it with an English descriptive word like 'Frost' to get 'Regnum Frost'.
Avalon. It has a mysterious and magical feel, often associated with Arthurian legends. It gives the impression of a place full of enchantment and heroic deeds.
Perhaps a fanfiction where Sebas discovers a long - lost magic in the Dragon Kingdom. He could then use this new - found knowledge to help the people there or to gain an advantage for Nazarick. For example, he might find a way to enhance his already formidable combat abilities.
Perhaps a story where Xion gets injured and Rixas has to take care of her while protecting her from approaching enemies. This would show his protective side towards her and also give room for some tender moments between them. They could also have deep conversations during this time about their hopes for the future in the Kingdom Hearts universe.