Legend27
For next passive i suggest Cyper power from marvel, :- omnilingualism (intuitively translates any languages he comes into contact with, including written, spoken, computer, or body language). with this passive he can increase his comprehension and maybe can copy and replicate any being magic system, not to mention in learning any martial arts
yess author i agree with the ability having does you defeated and killed became your slave using them to hone and gain experience in combat which the mc is currently lacking. and especially does who are smart that can be use as researchers to study some of does bloodline from yokai to gods so that it could boast the mc stats.