[@DeathXtheXTree]
1)Ai & Yuu - None
2)Rue - Regeneration 
3)Rabbit - Regeneration 
4)Aegis - Durability 
5)Karu - None 
6a)Ashe - Regeneration 
6b)Six - None
7)Raiden - None
8)Virgil - Regeneration + Durability 
9)Icks - Regeneration + Durability 
10)Lucia - Regeneration 
12)Grey - None
13)Krit - Regeneration + Durability 

These are numbers 1-13, the supposedly strongest members of the AG troop. Notice that almost every short - mid combat AG has some kind of Durability (I included stamina/ endurance within Durability) or regeneration enhancement, except the Gemini Sisters (Ai&Yuu). Six and Raiden are Snipers, Grey is a support/ scout, and Karu can make heads explode (eventually) from a distance. Note that I did not include variables such as Rue's Pain Absorption on this list (which would've been considered "Durability" since it allows her to stay within the fight longer than she should be able to), only straight up Regeneration or Durability.

Not that I'm complaining (this just means my characters don't get a "Jail Out for Free" card in battles), just an observation. Yuu's shield can probably block more shit than these guys can regenerate/ can take anyway :P