Gerlin's star ratings also follow the usual pattern, mainly focusing on two-star and full stars.
The stat increase at two-star has always been quite good. Now that Gerlin's base stats have been strengthened, this increase is even more attractive.
However, unlike other characters, Gerlin's three-star is also very desirable.
A three-star generally involves a minor mechanical change or a comfort improvement, either making the controls more mindless or unlocking team formations.
For other characters, three stars aren't particularly important since the stats aren't much different from two-star, and the change in comfort doesn't matter much—you just have to operate a few more times.
But Gerlin's case is a bit different.
Because his three-star enhances domineering body and damage reduction effects.