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Arch-Types are classes that certain characters fit into, the standard ones are mages, tanks, spellcasters healers etc. 
For TNR they would probably be Burst, Assassin, Tank, Balanced

Burst: These persons look to do massive amount of damage.
Assassin: To be able to kill someone with one rotation
Tank: To be able to withstand any damage and drag out battles
Balance: A little bit of everything but not a master of anything 

Any plan for a med ninja bloodline/archetype?

is the plan to have a focus on multi-ninja battles/raids?

I dont think they would work for this type of game. It would severely limit the amount of BLs you can have... Unless the plan is to multiple BL for each archtype