Speaking of that list and between us Kingdom fans, the human at the top of that list by the name of
Qin Shi Huang is the historical figure that Ei Sei from Kingdom is based on.
Another bit of trivia, the designs and personalities of Okita Souji and Kondo Isami seem to originate from another manga called
Requiem of the Shogun, a series that runs in the same magazine (Comic Zenon) as Record of Ragnarök and which also has the involvement of Umamura Shinya.