Seginus has always been a bit rejected amongst the Blacks, which made him grow close with his cousin Sirius. Despite being a flawless Black it didn't seem enough to the elders due to him having a empathetic, caring and kind nature. Along the years he also got close to Regulus, the quiet and melancholic boy, even if Regulus and Sirius didn't get along well Seginus would still try and keep a balance between them. Seginus is an original character of my own creation.