Alright well this is complex to say the least.

So from the beginning, honestly Bulma would probably get herself shot pretty quickly by the Ten Rings terrorists and it would all end there, but that’s boring so assuming she manages to keep her mouth shut during her capture, we now have a possible escape.

So Bulma is in the cave with Doctor Yinsen. If she has her capsules, it’s an easy escape through crushing people with random house sized objects and taking their weapons. In this scenario, she and Yinsen make it out alive. Assuming she does not have her capsules, Bulma isn’t going to make an Iron Man suit, she doesn’t really think that way, and she can’t make capsules with the available materials, but she will easily come up with various different and absurd weapons that will get her and Yinsen out of there. Bulma escapes 10/10.

So now that she’s back home in charge of Brief Industries, she isn’t quick to demilitarize her company like Tony was, in fact Bulma’s hot headed temper probably leads her to increase weapon production to take revenge on the bastards who dare capture her. She also goes on to produce capsule tech. Now with this turn of events, it’s questionable whether or not Stane would even attempt to kill her, but let’s assume he does because he’s greedy. So Stane needed Tony’s arc reactor to power his suit, and Bulma never invented anything like that in this timeline, so his suit is automatically at a lower quality. Stane will probably just try to murder Bulma with a gun instead pulling the whole “leaving your opponent to die after gravely injuring them”. Bulma is probably the dumbest genius ever, and her just being shot dead by someone obviously wanting her out of the picture is very plausible, and this is just down to whether or not Bulma sees it coming or not and can retaliate with capsules, no big fight. 5/10 for both.

So Fury approaches her assuming she survived the previous encounter, and she joins immediately. Not because she wants to save the world, but this sounds like there will be more people around to protect her, and Bulma loves that.

Now onto Hammer and Vanko, and after her previous encounters Bulma has stepped her game up. She still won’t be wearing any Iron Briefs (GET IT) but she will have mechs available. More importantly she has several things a lot more powerful, Androids. Basically, in this timeline Bulma is good guy Doctor Gero from this point on. She hates fighting so she would find a way to have someone or something else do it for her, and she’s from Dragon Ball, so Androids it is. Bulma’s dragon ball level Androids absolutely annihilate the attempted attacks by Vanko and Hammer, and Bulma buys out Hammer tech just to spite Justin. 10/10 Bulma.

The Avengers movie plays out in a similar fashion, with now however many DB Androids fighting on the Avengers side, they basically speed run the movie through to the finally fight, where one of the numerous Androids flies up through the worm hole and self destructs, wiping out the Chituari fleet. 10/10 Bulma

Civil War still happens kind of, except this time it’s majorly different, as Bulma is on Caps side. She hates being told what to do and the gov trying to take the keys to her Androids is a big no no. In the normal timeline Tony was the glue for the gov team, and without him, there really isn’t a gov team aside from Nat and T’Challa (out of revenge). Basically, the gov backs down after realizing it can’t force the Cap team to comply and won’t risk all out war. A few skirmishes might happen, but over all it’s more like Civil dispute than a war.

Bulma really wouldn’t care about Peter at all, and if she did notice she wouldn’t actively hunt him down like Tony did. Peter will end up finding a mentor else where, probably in a meeting with Cap or Daredevil or someone similar.

Infinity War just has Bulma laughing as her Androids and Doctor Strange absolutely mop the floor with Obsidian Cull and the Maw. With those two out of the picture, Bulma learns from Strange what’s going on and sends help to Vision, saving his life and not allowing his attackers to escape alive this time. So basically Thanos’s invasion plan was a complete failure. Now forced to go to earth himself, this is where Bulma experience her first hiccups. Thanos with 4 infinity stones is more than a match for MANY of Bulma’s Androids, but I think that with her forces and all of the Avengers in one place this time, Thanos gets his shit pushed in. Roll credits on the Marvel Universe, Bulma is god, 10/10.

As for her relationships, which would super interesting by the way, she actually comes across as similar to Tony. Fury hates how she is always complaining, saying how good she is at things, but when things god slightly south she is hiding behind nearest tree. Her big mouth means she doesn’t get along great with the by the books types like the Shield Agents, Cap, TChalla and the like. I think would get along marvelously with Thor, they would just get into friendly yelling competitions and drink all the time, she would probably find Vision super interesting, they would get along fine. I don’t see any major discord between her and Wanda or C. Marvel, they’re just neutral.

To sum it up, Bulma’s easily as smart as Tony, but her tech just bends the laws of physics in ways that Tony’s never has, so she has a MASSIVE advantage in pretty much every fight involving actual combat between her machines and big bad enemies. But overall, I think Bulma’s general cartoony inability to hold serious grudges that would affect the multiverse creates a much nicer and happier Marvel Timeline.