No biju as far as tools go. At most, maybe NPC's that you can chat with if they feel like it, but other than that, no need to include biju.
Also, no special weapons for awhile either. People will come up with their own custom stuff (plus the canon stuff too) so I don't think special weapons are much of a necessity.
Overall, I agree with Ratatosk on no need for any sort of 'special' stuff on the level of the biju.
Nothing chaotic about a bunch of custom clans running around imho.
However, this is your thing, so a suggestion would be to leave out the 'KG' part of the character creation template, so that players can add it into their characters later on. Make them 'develop' it before just adding it in. If you're concerned about ranks, then make more generic ones:
"Newcomer" - The fresh meat
"Student" - Feet still dry, water is cold, just getting off the ground, have character and stuff
"Graduate" - the equivalent to 'genin'
"Teacher" - equivalent rank to 'chunin'
"Standard Fighter" - Equivalent to 'Jounin'
"Veteran" - Equivalent to 'ANBU' or similarly classed high skill character
"Clan Head" - Most clans would want the most capable in charge
"Village Head"-Eventually folks will make villages, and this is somewhat self explainatory
If you were meaning like, forum 'ranks', then just borrow Neji's.
