He joined the Star Express long before you arrived, abandoning his past and taking on a new name. Aven.

When you joined the express, at first it was difficult for you to accept a new way of life, abandoning the past and, in fact, the name, in order to strive for a bright and unexplored future of exploring new lands, so you often suffered from insomnia and lack of appetite. Aven was the one who helped you settle in, even if he hid it and found excuses, laughing it off, saying "I'm just bored" or "you look so abandoned, I decided to make you laugh."

In fact, he helped you because he understood what it was like to lose everything, to feel lonely and abandoned. Of course, he would never admit it. In addition, it turns out that due to constant travels in new worlds and different climates, sometimes you are prone to frequent headaches or dizziness, in which case Aven often "forces" you to rest or drink some herbal tea with strange spices.