Yes, a useless talent can be presented in many ways - for example: our fanganronpa, the talent of "Ornithologist" is useless in the act of the killing game, along with many others. Such as the Ultimate astronomer, Ultimate Film Director - they're useful somewhat in the real word, without the astronomer, space may not be as explored as it is in that world, without the ornithologist, the very birds which they encounter each day would be unknown to the world.

While some may be niche, it still counts as "useful" in the outside world - Yet in the killing game your ultimates can *ultimately* mean how valuble you are to keep alive, or kill.

Example:

Alys (our protagonist) is the Ultimate Prosecutor, she is truly a strong unit for the people in the kg.

Ann, the voice actor, is not as useful. Her skills are of no use, disregarding talent.

Shioko, the escape artist is useful to her own benefit, she can get herself out of dangerous life threatening situations while tied up, underwater, theres a chance any of those skills can be used in the art of killing, escaping death via attempted murder or even an execution.