Alternate realities
Kenny: Huh? Who are you?
Trix: I am Trix Tennyson.
Kenny: Tennyson? Any relation to my father, Ben Tennyson?
Trix: I’m the daughter of Eunice and Ben Tennyson.
Kenny: What? No way! That’s impossible. My dad married my mom, Kai Green.
Trix: He did in your universe, but in mine, he’s very much endgame with my mother, Eunice.
Kenny: That’s crazy.
Trix: The multiverse can be a crazy place. Our dad had multiple love interests in his life, and there are universes where he’s endgame with each one. Because of that, I’m here to tell you that going back in time to maintain your existence is not necessary.
Kenny: It’s not?
Trix: No. In fact, you put more risk on yourself by doing so than not. While there is a universe where Dad did get with Ester in the end, that’s not the fate of your universe or mine. You can relax and sleep soundly. You’re secured.
Kenny: Um… Ok. Thanks.
Trix: Feel better now?
Kenny: Yeah. I think so. So, uh… are you, like, my half-sister?
Trix: I suppose so, in a manner of speaking.
Kenny: Do you have an Omnitrix too?
Trix: Don’t need one. I am one, and then some.
Kenny: Huh? What’s that supposed to mean?
Trix: You see, my mom is a living humanoid Unitrix, which is a less impressive version of an Omnitrix. She can copy DNA like our Dad, but can only do so one at a time, and she can’t transform like he can; she can only mimic natural powers. I’m half human and half an Omntrix version of what my mom is, but I’m innately and physiologically stronger, faster, smarter, more durable, more talented, and more potent than both in every way. I can absorb, mimic, control, and create different Omnitrices and make playlists for them inside me. Each Omnitrix has its own playlists of different powers and species. Playlists within playlists. In other words, what various Omnitrices can do with species, I can do with Omnitrices themselves.
Kenny: That honestly sounds really cool.
Trix: It gets better. I can use my senses to copy and index any species, regardless of whether it has DNA or not, is extraterrestrial or not, is a superpowered subspecies or not, is sapient or not, etc. I can either fully transform, partially transform, or just mimic abilities. I can choose one form and/or ability at a time or combine as many as I want. But I can only become sapient versions of otherwise non-sapient species. I can also freely change and control my own genders and sexualities at will, but I hardly use that. All of my abilities are limited only to my internal virtues and survival instincts.
Kenny: Whoa. You are definitely set.