zaraki kenpachi... I mean, Michael can easily become by far the strongest, in my view he has the greatest potential, considering that in human form he already was very strong, and now he got even more. with radioactive powers, man... he could in the next evolutions (if the dev allows it) have some kind of maximum atomic control, do you know what that means?, nuclear bomb baby, Michael could have an atomic punch like Garou from OPM, and also emit bursts of gamma radiation that spells from black holes, and neutron stars, this skill would be the protagonist's and Ella's maximum counter, as it would destroy their bodies in atomic level. Michael>all