Which main characters in anime had no sense of existence?

There were many main characters in anime that had no sense of existence. Here are some examples: 1 Alan Yeager in Attack of the Giants: Although Alan is one of the main characters, his presence in the story is very low and he often appears in various backgrounds. 2. Naruto Uzumaki in Naruto: Although Naruto Uzumaki is the main character, his presence in the entire story is very low and often ignored. 3. Monchi D. Luffy in One Piece: Although Luffy is one of the main characters, his presence in the entire story is very low and often ignored by others. 4. Ishida Yulong in "Death": Although Ishida Yulong is one of the main characters, his presence in the entire story is very low and often ignored by others. 5. Keisuke Hashida in Gintama: Although Keisuke Hashida is one of the main characters, his presence in the entire story is very low and often ignored by others. 6. Kagome in Inuyasha: Although Kagome is one of the main characters, her presence in the whole story is very low and she is often ignored by others. 7. Qin Chuijin in "Qingyin Shigure": Although Qin Chuijin is one of the main characters, her presence in the entire story is very low and she is often ignored by others. 8 Everyone in Middle-earth in Fate/stay night: Although everyone in Middle-earth is the protagonist, their presence is very low and they are often ignored.