In RPGs, when frailty is mentioned, most players would hardly ever associate weak characters with being powerful.
Weak characters either possess extremely strong attributes or have a very fluctuating subplot, or if nothing else, they have some unique skill.
However, they are also burdened by their weak attribute, or are extremely fragile, or have certain limitations on the number of action rounds.
They seem powerful at first glance, but actually, they keep jumping back and forth around the passing line.
The causes of frailty in these characters vary, some from innate physical weakness, others from curses, and yet others from unknown diseases.
If the frail state of these characters is ignored, in the best case, they will follow the protagonist to the end and die young; in the not-so-great case, they will die young in the middle of the game; and in the worst case, they appear for a few turns and then die young.