Anyways my stupidest and most unfounded and least canon Invader Zim Headcanon is that what we hear as a British accent on Alien Characters is actually a Vortian accent.
I mean, yeah, there’s only one Vortian in the show who speaks with a British accent, but that still accounts for 50% of the entire canon Vortian cast of the show! (Compared to the one British Irken we know, who is much more in the minority)
And since Irk and Vort used to be such close allies, I… think it makes sense they’ll be a lot of Vortians with good Irken (American to our ears) accents, like Prisoner 777. And maybe some Irkens who picked up a Vortians accent over the years.
If Tak has spent a lot of her formative years on Vort, or even was born on some off-world Smeetry in Vort - that might explain where she picked all the mechanical chops she has (since she basically had to built all of her equipment herself and it’s all better than the standard-issue professionally-made Invader equipment) and why she seems to have a greater sense of individuality then your average Irken (her outfit and personalized logo)
Invader Zim episode where he starts constantly referring to himself as an E-Boy because he’s under the inexplicable impression it stands for ‘Earth Boy’