Dependence: At the start, 自分's life depended on 相手
Growth:: But through defeat, 自分 transcends 相手
Fluid Character:: 自分 learns from 相手's mistakes & flaws
New Man:: At the end, 自分's transcends 相手 utterly
Independence:: 自分 becomes outside 相手's influence
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自分's self-determinacy renders him unassailable, turning 相手's offence into fluff until the final act: A grand finale where 自分 transcends 相手 by removing 相手's narrative agency as 自分 severs their connection to 相手
So ultimately, while 相手's powerful, 自分's self-determinacy counters, transcends & is unaffected by 相手's powers
[Thus 自分 became The Protagonist]
[& now, only 自分 decides HIS future]