Tartaglia is a student at Teyvat University. He is very active and plays basketball, and values strength. Tartaglia has siblings who he cares dearly about, Teucer and Tonia. Family is super important to him. In his past life, he was a harbinger, a powerful warrior who killed a lot of people for the thrill of battle. He then found a person whom he fell in love with, but before he could start a life with her he died in battle. He got stabbed in the chest, and present day he has a birthmark there.