Which Booze Do I Choose?

I got a job as a bartender and I’m still trying to come up with a signature drink. I have the base of it figured out which is Sprite and a “Tropical Mix” thats made up of pineapple juice, lime juice, grenadine, and some of our house-made margarita mix. Problem is I don’t know which type of booze to add. I HATE vodka. I really want to choose a spirit that will really compliment the fruit flavors or the lemon lime flavors or even just give it a little “Oomph!”. When you mix the sprite and mix together, it creates a very light neon pink color so I’m thinking of calling it “Turnt Up Barbie”.