An original series, David Production's Onmyo Kaiten Re:Birth Verse is messy and frustrating. Besides its isekai aspect, the anime also has sentai-like transformation, mecha, kaiju, alternate worlds, ...

Some of the more popular fantasy anime have MCs who start weak but get OP later on through either a plot twist or sheer will and hard work.

The Winter 2025 anime season does not have as many overpowered isekai protagonists as usual, but these MCs are still very strong.