Here are a few examples of anime villains that are often viewed with a sense of pity or sadness:
Griffith (Berserk): Griffith is a character who starts as a charismatic and ambitious leader in the anime "Berserk." However, his path takes a dark turn, leading to terrible choices that ruin the lives of those around him. Despite his heinous actions, some viewers can't help but feel sorry for him due to the tragic circumstances and psychological trauma he experiences.
Itachi Uchiha (Naruto): Itachi is initially portrayed as a villain in "Naruto," responsible for the massacre of his entire clan. However, as the story unfolds, his motivations and reasons for his actions become clearer, and viewers start to understand the burden he carries, making them feel sympathetic towards him.
Solf J. Kimblee (Fullmetal Alchemist: Brotherhood): Kimblee is a State Alchemist known for his merciless and sadistic nature. Yet, in the "Fullmetal Alchemist: Brotherhood" anime, his backstory reveals the consequences of his twisted sense of justice, leading to some viewers feeling a degree of compassion for the tortured soul he became.
Shou Tucker (Fullmetal Alchemist): Shou Tucker is infamous for his unethical alchemical experiments in "Fullmetal Alchemist." As the tragic story behind his actions is unveiled, some people may feel a mix of disgust and sympathy for the desperation and choices he made.
Mereum (Hunter x Hunter): Mereum is the antagonist in the Chimera Ant arc of "Hunter x Hunter." As a character who evolves and experiences personal growth, viewers might find themselves empathizing with his internal struggles and eventual realization of the impact of his actions.
Remember that the depth and complexity of anime villains often contribute to the emotional impact they have on the audience. Feeling pity or sadness for these characters doesn't justify their actions but can illustrate the power of storytelling and character development in anime.