Synonyms that are in the dictionary are marked in green. Synonyms that are not in the dictionary are marked in red.
Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
At the moment, both of these characters are just quest-exclusive NPCs who appear in the game's official storyline.
Source: https://gamerant.com/genshin-impact-leaks-ayaka-re-run/