Frieza doesn't have a backstory as to why he decides to conquer galaxies, other than he's very strong and maybe because his pops is a dick? I suppose now his motive is "KAKAROTTTTT!!!!!!!!!!!!!" hatred of Goku, people who look like him, and his friends by association?
Buu doesn't really have a motivation for his destructive tendencies other than he's very strong and I guess because his pops is a dick?
The Androids don't really have a motivation for their violence other than they're very strong and their pops is a dick? I guess Dr. Gero has a different motivation, in th he actually wants revenge against "KAKAROTTTTTT!!!!!!!!!!!!!!!!!!!" Goku, but he's just a Paragus to the actual villains of the arc.
Cell's motivation is actually novel. Yes he's very strong, and yes his pops is a dick, but he's actually driven by his part Saiyan biology to seek greater strength and greater challenges. So I guess that's one.
Freiza is some guy who believes himself the strongest and a fucking racist to a set of people because they could actually beat him (which one of them did twice). Not much indication his Dad was a dick to him though since he actually revived him and all that plus Freiza himself didn't even kill him nor gave any indication that he wanted to. Maybe that would happen if his father wasn't trash.
Buu is the nearest to Broly in having similarly trash motivation and can hardly talk so i can give that one *shrug*, but even then he had that whole good and evil, supreme kais stuff to bolster him somewhat.
The androids were shown to have no motivation for anything and they became victims rather than villains but i will give you that their pops being a dick actually works here as well, hell they even killed him too
Cell took over from the androids with the villain ball and his just a dick on his own with his own motivations so no need for his pops to be a dick here (plus is Father is long dead).
Yet all of them were more interesting than Broly.
If Toriyama can make him actually have an ounce of personality other from million variations of "die" and can also wreck shit like the old days then i would be
all in for this Broly.
Imagine seeing Vegeta cry in 2018 because of this version, it would be fucking glorious :D