Guardian1
I think a good base for his powers would be the mc becoming a viltrimite. They should count as sci-fi because they reached their powers through artificial adaptation and genetic manipulation. Their powers are mostly physical and are naturally intuitive with no need to train as they get stronger with age. With powerful DNA that takes all the positives and overrides the negatives during reproduction. Also, they have limited psychic abilities, and any damage received short of death increases their powers.