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I have some gold pristella tetras and ember tetras that are peaceful. And I also had some black skirts and serpae tetras that were aggressive. I've also had some mollies that were mean. My guppies have all been peaceful. My two male cobra endlers are very peaceful and I like they're bright orange markings.
Male guppies CAN pick on other fish if its injured or something, and some can just be butts females don't bother anybody they just generally are not as colorful. Mollies are mostly peaceful, again though some males are just plain mean! For live bearers platies and swordtails are much more peaceful. I have a whole colony of endlers but that's all thats in that tank so I have nothing to compare them to! Lol there is do much variety with tetras though and they are so much fun to watch school
Small tetras such as neons, cardinals, and rummynose school and are peaceful. Rasboras are also good. Cory cats are fun and peaceful bottom dwellers. Threadfin rainbowfish and Hatchetfish also also good choices for upper level swimmers.