1 - The Stone Generals (TMNT 2007): Ancient warlords turned to stone after being cursed during a conquest 3,000 years ago. They are re-animated during the events of the movie and serve the immortal warlord Yaotl as his lieutenants, charged with capturing 13 monsters running rampant across NYC

2 - The Kingsguard (GOT/ASOIAF): An elite order of seven knights sworn to protect the king and royal family, bound by vows of celibacy and service until death. Members of the Kingsgaurd are (sometimes) the most skilled and renowned knights in the seven kingdoms.

3 - Akatsuki (Naruto): A rogue ninja organization composed of powerful missing-nin from various villages. Initially formed to achieve peace through strength, the group devolves into a criminal syndicate seeking world domination through manipulation and control of tailed beasts.

4 - Gotei 13 (Bleach): The thirteen divisions of the Soul Society’s military, charged with defending the spirit world and regulating souls. Each division is led by a captain and vice-captain, and each has a special ultimate ability known as "Bankai". "Squad Zero" are an even more elite group above the 13 that directly protect the Soul King.

5 - Knights of the Round Table: Here the picture is from FGO (Fate series) but both the Arthurian legend and anime version fit the trope

6 - The Godhand (Berserk): A pantheon of five archdemons serving as the executors of causality under the Idea of Evil. They manipulate human fate, orchestrating massacres and sacrifices to perpetuate despair and maintain the cosmic order of suffering.

[Loved trope] The Legendary Royal Guard