In Persona 4: Arena, there are six Navigators (essentially, announcer voice packs) that are available as optional paid DLC. In the Marketplace description for all six DLC items, however, it states that "skilled players can unlock this content by playing the game."

I know of the following **confirmed** methods so far:

> 
> Teddie: Clear Story Mode completely  
> 
> Mitsuru: Complete 100% of one character's challenges  
> 
> Nanako: ???  
> 
> Aigis: ???  
> 
> Fuuka: ???  
> 
> Yosuke: ???
> 
> 
> 

How can I unlock the remaining Navigators?