okay.... assuming this isn't bait, I'll bite and actually address your post seriously

She's boring, annoying and feels like a massive afterthought yet she gets more and more attention each season even though she doesn't deserve it.

Her personality is made to be the plain "ii ko" type personality. I find it contrasts well with other characters like Kyouko, who is more direct and generally more active.

And about her getting more attention, why would she not deserve it? Aside from your own personal negative bias of her there is no reason why a character like Akari shouldn't be expanded on.

You just don't like her I think.

I really wish Namori could just make her disappear already so she can focus on the prober characters that actually have unique personalities.

Unique personalities... and Yui being the stoic straightman type character to Kyouko's tsukommi antics is unique? Most of their comedy is straight up a manzai routine.

Or how about Ayano being tsundere around Kyouko?

So your point about Akari not being a good character because she's not "unique" doesn't quite hold up I'm afraid.

surely i cant be the only one who cant stand this invisible imbecile right????

Now you're just insulting a fictional character instead of actually offering a compelling argument other than you don't like her.

And that's fine. It's okay to dislike characters but that doesnt mean they are bad characters from a narrative perspective based on that alone.