i also thought of anohter one two.
it was based off of naruto.
ok in naruto ur a ninja who uses chakra. u get ranked in naruto by one of these ranks.
not a ninja-ur not a shinobi at all ur just normal
acedemy students-lowest rank if ur a ninja. u go to the acedemy to learn the basics about being a shinobi and doing jitsues.
gennin-a rank above acedemy student. u r officale a ninja now
chunin-u now can do hardy missons then before
junnin-u do hard missions and u are incharge of squads
anbo-ur a highly skilled ninja and do hard missions for the hokagay and stuff
hokagay-head of ur village and is known as the wisest and strongest in the village
hakski-u proven urself as a killer and have done something bad(as in deystroying ur clan.) u got a bounty on ur head
ok thats the ranks
also in naruto there is villages. if u don't no them like me u can just use this link here
Naruto villages - Naruto-Kun
and to gain exp u can do missions. in naruto there is tons of missions as in killing some1 gaurding them and even finding a cat. and everymission u complete u get money,but the harder the missions the more money u get.
the lowest mission is a d rank i belive and the highest is a. but to do a rank missions u have to have a high ninja rank.
well this was just a though