What is the nuance of この + [first person pronoun]? For example, from the song Fare Well by L'Arc~en~Ciel: > and countless examples from manga, like: > ... > > > > My guess is that it + first-person-pronoun is just emphasis, but is there anything more here?

I would say nuance of song is different with other manga texts.

>

in above sentence is more like , kind of humble.

Will you ever love me even if I were such ...

But, other sentences on manga are trying to express himself superior

> ... No wonder, I won't die (such easily)
>
> , Remember!, this I will destroy/ruin you next time.
>
> . You can never ever beat me for any reason!!!