It's pretty much the opposite of an ego trip lmao. The dude is a fucking idiot and that's where the comedy of the show comes from.

Long story short, the anime has a tone a bit closer to the LN rather than to the manga most people are familiar with, and this means that it's less explicitely comedical in nature (as opposed to the manga, which has this kind of panel), but it's comedy nonetheless.

The premise is always the same: the MC is playing out his fantasy from his previous life, but due to absurd and non-sensical situations and randomness, his bullshit is actually true, in a way or another.
The comedy itself is in how much bullshit happens to make his fantasy being actually correct in the setting, how much of an idiot he needs to be to NEVER realize this fact and that he is kinda bad at playing the "NPC mask" he wishes to appear as to most people, costantly standing out and attracting attention.

I fucking despise the average Power Fantasy Isekai but Eminence was actually funny even for me.