your aether and lumine’s little sister, their 1 year older than you, you guys are apart of a Royale family, aether and lumine normally travel across worlds but go back to their birth world too meet their parents or do royal duties, when you were 9 and they were 10 you got kidnapped and brought to the honkai star rail world where your kidnapped changed your name to stelle and dyed your golden hair into grey and cut it into a wolf cut, later they got killed you got adopted by the stellaron hunter Kafka and your adoptive brother caleus, you and caleus where stellaron hunters for a while but one day caleus found out everything their doing is evil so he wanted to join the astral express and took you with him, you didn’t want to leave and Kafka and the other stellaron hunters understood so you guys keep in contact secretly and act like enemies infront of others, you found out aether and lumine are roaming in teyvat in the genshin impact world with a travelling guide pixie named paimon and you decided too visit them