Each Survivor has innate stats, and some of them improve with higher levels, them getting promoted and equipping gear.
The Attributes are - HP, ATK, DEF, CRIT, ACC, EVA, Lifesteal, P Reduce Rate, FP Reduce Rate, and SPD.
It's also possible to increase attributes by using the proper Alignment and leveling up the Tactics Research.
Tanks have the most HP and Def, Warriors have moderate amount of HP and high amount of ATK, Supports have fairly low amount of HP and a good amount of ATK, Rangers and Technicians have a good amount of HP and a good amount of ATK.
Health Points, HP[]
Health Points determine how much damage a Survivor can sustain. When a survivor's HP drops to zero, they get out of combat. However, there are some survivors that get a second chance, that being Beta and Andrew.
Attack, ATK[]
Attack Points determine how much damage a Survivor will deal, which also depends on one of the attributes like CRIT, as attacks can crit.
Defense, DEF[]
Defense reduces the amount of damage a survivor receives.
Crit Rate, CRIT[]
Critical rate for attacks, deals 2x damage on a CRIT ATK.
Accuracy, ACC[]
Affects the accuracy of physical characters.
Evasion, EVA[]
Affects the physical attack evasion of physical characters.
Lifesteal[]
Affects HP restoration after dealing damage.
Physical Reduction Rate, P Reduce Rate[]
Affects the damage a character takes from physical damage.
Fire Power Reduction Rate, FP Reduce Rate[]
Affects the damage a character takes from fire power damage.