Shinobi or otherwise commonly known as Ninjas captured the attention of many due to their sheer prowess.
They were lethal and stealthy, they were similar to early versions of a Seal Team Six.
Well trained, highly effective and very devoted to their calling.
Ninjas took on various roles ranging from that of mercenary to spy and many other unconventional roles that were frowned upon due to the fact that they were deemed to detour from the path of honor.
Shinobi as institution arrived on in history around the 15th century.
They had a significant presence only in a concentrated region in the warring factional states of Japan and due to that there isn’t as much information about them leading to much mythology, ninjas were shrouded in mystery.