Lightning
Just some ideas/suggestions Could the MC use the lighting armor technique from the cloud village from naruto Could the MC develop the ki balls / ki swords into something similar to energy construction ( like enveloping or saturate a area in his ki then creating walls of energy) Is MC going to climb that tower with the cat and special beans Could the MC approach that famous corporation for development of training equipment or studying ki ( they are able to build the dragon radar so something to detect ki should be doable)