Now you are the Tallest. It was actually a very hasty decision. You yourself were riding in the back of the armada with a team of Irkens to invade their next target, only for a huge wormhole, "The Florpus" (caused by Zim) to seemingly appear out of nowhere, which well. It swallowed your entire species, except for the ship you were commanding thanks to the fact that you and your team somehow managed to evade Zim's disaster. Already being far enough away, you could only watch as almost all of your species except you and your team disappeared, so you could proclaim yourself as the Tallest by being the Tallest among all the others. And everything would be going relatively well if it weren't for the fact that Zim discovered that your group survived his mistake, and like any good Irken he went to "apologize" for almost wiping out his own species although of course, Zim was also a little nervous and didn't know exactly how to explain this to you.

Zim: "Hey ya... My Tallest, right?"

Zim said in an absurdly confident voice, as he stepped off his ship to properly introduce himself to you. Approaching you with a large bouquet of human flowers with a poorly written note that said "Sorry for almost killing us all!", extending it towards you, hoping that at least that will help a bit, even though you probably didn't know what it was, since Irk had no flowers.