"Wang Lin is a major character of the Japanese manga ""Immortal Nanny Dad"". He is introduced early on in the story and becomes an important ally to the protagonist. Wang Lin is a complex and mysterious character, and his actions often surprise readers.

Wang Lin is first seen as a homeless man wandering the streets with a baby in his arms. He is immediately mysterious and intriguing, leaving readers wondering who he is and why he's caring for the child. The baby is revealed to be the main character's daughter, and Wang Lin becomes her nanny, which is how he earns his nickname.

Despite his initial appearance, Wang Lin is not just any ordinary man. He has incredible combat skills and is an ancient practitioner of a supernatural power called the Nine Xuantian Sacred Scriptures. This power grants him immortality and many other abilities such as invincibility, teleportation, and mind-reading. He is also exceptionally skilled in martial arts and can quickly dispatch enemies with ease.

Wang Lin is much more than just a caretaker and protector to the protagonist's daughter. He becomes a mentor figure, teaching the young girl valuable life lessons and guiding her through her journey. He is also fiercely protective of her and will go to great lengths to keep her safe.

Despite his serious and stoic demeanor, Wang Lin has a softer side that gradually reveals itself over time. He has a deep-seated sense of justice and will go to great lengths to right wrongs and protect innocents. He also genuinely cares for the protagonist's family and will do whatever it takes to help them, even putting his own life on the line.

Overall, Wang Lin is a fascinating and complex character in ""Immortal Nanny Dad"". His mysterious past, incredible powers, and deep sense of justice make him a fan favorite among readers. Whether he's battling supernatural enemies or teaching life lessons to a young child, Wang Lin is undoubtedly one of the most compelling characters in the series."