instead of ninjas i would rather see them put in power items like advanced threads/refines, mood scrolls, charms, purification runes, purification protection runes, cave keys, magatama packs, etc. Of all the ninjas you listed 3 can be used with high end pvp teams currently(jiraiya, naruto, mabui) and Asuma can be used for 9tails. Other than those 4 ninjas they are all for collectors, and new players are better off being able to get free power items over free outdated ninjas.