Ugh, this one always gets me a bit heated because people tend to oversimplify Albert's character, and honestly I think the translation/localization differences over the years haven't helped. In 'Candy Candy,' he's the mysterious, wealthy man who rescues Candy as a child after she runs away from the orphanage. He's often called her 'onii-sama' (big brother). But his role is way more layered than just a guardian angel.
He reappears throughout her life, often in disguise or under different names, acting as a protector and a sort of North Star for her. The whole dynamic is this slow-burn, will-they-won't-they spanning decades, complicated by class differences, her feelings for other characters, and his own secretive nature. Honestly, the fandom debate over whether he's the true endgame love interest or a symbolic father figure is endless, and I lean towards the former.
What makes him pivotal, for me, is that he represents the stable, unconditional love Candy never really had growing up, but it's wrapped in so much melancholy and missed timing. He's the anchor in her chaotic, drama-filled life.