Another of the 2009 CyberAgent designs. The knight blue was created in response to the suggestion that the "hat" of the CyberAgent Samurai would not permit a great deal of visual range and therefore the head design needed to be changed. Plus it was also an attempt to add a greater range of colours to give the team more of a "power rangers" vibe.
Initially the two knights (one blue and one white) were intended to be added to the CyberAgent Samurai to increase the team from 4 to 6, but it was later decided to make the CyberAgent Knights a separate team in their own right (with a brand new yellow, black, red and zero unit of their own).
from the fiction point of view these two teams coexist at the same time, and each red, yellow, black and Zero unit is just an upgrade of each other.