One of the villains of ジョジョの奇妙な冒険, Dio, frequently refers to himself as「このディオ」 (to the point it became a meme).
What's the meaning of this grammar: この+own personal name? Is it just emphasis? Or are there other nuances?
(might be related to What is the nuance of この + [first person pronoun]?)
Yes that's basically the same as この in この俺. この by itself just means "this". This type of この is an emphasis, and in this context it has a nuance of "nobody else but me/Dio", "of all others, me/Dio", etc. この俺 usually sounds more or less prideful, but この私 can be a humble and polite expression depending on the context.
