Hazurewaku no "Joutai Ijou Skill" de Saikyou ni Natta Ore ga Subete wo Juurin suru made, Boushoku no Berserk: Ore dake Level to Iu Gainen wo Toppa suru Recommendations
Both have skills that are considered trash or useless. But after some incident, his skills turned out to be very powerful and then he became someone who was useful to those around him.