In Ultimate Ninja Blazing, Ninja Rank refers to players' level.
To increase Ninja Rank, players need to earn EXP. EXP are gained by completing missions. Once the EXP gauge gets full, Ninja Rank increases.
Players can have more stamina and capacity for team setup as Ninja Rank increases.
Tsunade (The Slug Ninja)
Kankuro (Orchestrator of Tragedy)