"You really think you've got the forces for that?"
"Do I have the necessary forces? You fool! The guards for this event are more numerous than those you see here. There are two entire fleets stationed over a surrounding area of tens of kilometres, not to mention elite troops numbering over three thousand. You may be powerful, but even you cannot..."
"Like I said. Are you seriously telling me you think that's gonna be enough?"
― Jack Rakan and The Chancellor (Negima)
"Soldiers, Armies, Zhao, Qin...You are all insignificant."
― Hou Ken to the Kyou Army (Kingdom)
"Once the boy had sneaked into the pirates' hideout, right then and there, he killed all 500 of the kingdom's soldiers who were taken hostage."
Dale (For My Daughter, I Might Even Be Able to Defeat the Demon King)
Issei Hyoudou (Highschool DxD Ex)
Roland (Madan no Ou to Vanadis)
Azi Dahaka (Problem Children Are Coming from Another World, Aren't They?)
Kirito (Sword Art Online); Alicization arc only
Jin Toujou (Testament of Sister New Devil)
Moroha Haimura (Seiken Tsukai no World Break); in his past life as Kensei Flaga
Hou Ken (Kingdom)
Kyou Kai (Kingdom)
Zen Ou (Kingdom)
Emperor Calus (Destiny)
Lost Force/Restrictors (Dirge of Cerberus: Final Fantasy VII)
Kratos (God of War series)
Zeus (God of War series)
Sora (Kingdom Hearts series)
Nightmare (Soul series)
Cu Chulainn (Valkyrie Crusade)
Chin (Hong Kong 97)
Cu Chulainn (Irish Mythology)
Achilles (Greek Mythology)
Arjuna (Mahabharata/Hindu Mythology)
Bhishma (Mahabharata/Hindu Mythology)
Drona (Mahabharata/Hindu Mythology)
Karna (Mahabharata/Hindu Mythology)
Krishna and most warriors (Mahabharata/Hindu Mythology)
Parashurama (Mahabharata/Hindu Mythology)
Hel (Thor: Ragnarok)
Bantenin (Houshin Engi)
Anti-Army Noble Phantasms (TYPE-MOON)
Madara Uchiha (Naruto) takes on the entire 4th army of the Allied Forces during the Great Fourth Shinobi War and completely overwhelms them.
During the final days of Third Great Shinobi War, Minato Namikaze (Naruto) became famous for killing over 100 shinobi earning the title, the Yellow Flash.
Kuro (One Piece) slaughtered an entire ship full of trained Marines with his immense speed.
Rob Lucci (One Piece) is a genius Rokushiki (Six Powers) master hailed as the strongest assassin of his generation. Even at the age of thirteen he killed over 500 soldiers and a entire crew of pirates by himself.
Donquixote Doflamingo (One Piece)
Charlotte Amande of the Big Mom Pirates (One Piece) is a powerful master swordswoman…
…capable of massacring an entire army of armored knights single-handedly.
Cu Chulainn (Valkyrie Crusade)
Oryx (Destiny) can eliminate all of the Guardians with his powerful move "Doxology".
Emperor Calus (Destiny) with his Imperial Nova attack is capable of annihilating all his enemies at once.
Guts, the Blackswordsman (Berserk) became infamous for slaying over 100 Tudor Mercenaries during the 100 Year War earning the title, Hundred Man Slayer.
After 300 years of endless combat, its just another day for Zodd the Immortal (Berserk).
Hou Ken, the Bushin (Kingdom) made his first appearance by easily destroying a Great General's army.