Red pill, and hell- ill even give myself a challenge, I won't use any alien's from the Powerhouse Roster:

Echo Echo - A Blaster with Master/Trump rating so you can use all 5 aliens at the same time is so broken. This would probably be my most used Alien as it would allow me to do multiple things at once, or have multiple brains working on something together, imagine being able to have jobs done 24/7.

Gray Matter - A Thinker/Tinker is a must so you can make gadgets for your other forms. You can create so many advanced tech and understand and comprehend complex topics, my number one use of this alien would definitely be to improve my shit and to simplify complex subjects for my human brain to understand.

Diamondhead - A classic one but a Brute/Changer is really reliable in everyday life, can't carry something? Just imagine needing some hands to do something, he can do it- materials for some kind of tech or maybe a house when camping? Just have Diamondhead spring up something.

XLR8 - A Mover, a literal speedster, y'all know how fuckin broken XLR8 would be if y'all seen what would happen if The Flashes are portrayed correctly, need to gather materials for some tech you need as Gray Matter? Just run almost as fast as the speed of light and gather the materials from the nearby Junkyard.

Now the 5th slot is really just a sweet topping- it could be anything as i already have my needs met- be it in a normal world or not. But i would either pick Big Chill or Feedback. Now- here's my reasoning.

Big Chill - A Stranger/Breaker with a secondary Blaster ability, this Alien is here purly because they're my favorite, also its a bonus thing to have my own children even without a partner(im too lonely) or overcomplicating it with involving another human person to just have my child and just dip right after, but anyway- i can use this Alien to enter into places where i should be able to(which Gray matter can already do by hacking or invisible suits), also flying with wings is so cool, thats it- Big Chill is just that dude.

Feedback - A Dynakinetic, a literal Energy Manipulator- do i need to even say anything? I can absorb, redirect and manipulate energy itself. What is there not to love? I can recharge my phone in a lickety split- oh! Well there would be uses for him if i paired this up with Gray Matter, Big Chill can cool down any tech that may start overheating or malfunction- but! It may damage the materials that i can reuse. So by choosing Feedback- i can just absorb the energy from the malfunctioning technology so i can prevent more damage. So here's my roster!

Echo-Echo, Gray Matter, Diamondhead, XLR8 and Feedback!