Goku beat up Tambourine and Freezer because of Kuririn. Kuririn was his first rival and his comrade as student of Muten-Roshi and all.
However, Bulma also shares a special relationship with him. She was the one to introduce him to the world, he learned a lot from her that he would have never known, he got to experience what the Dragon Balls are and pretty much nothing he get to know in life would have happened without her. There are never those moments where Goku cries because of Bulma, I know but I don't think that is necessary for them to be best friends. And if Bulma actually would have been killed I am pretty sure Goku also would have reacted the same as he did because of Kuririn.
Then of course there is also Vegeta. And not only Vegeta but Piccolo. Archenemies that have become rivals and eventually even friends. Whether it is because they are so similiar because of their nature as Saiyajin (Goku and Vegeta) or just because whatever they have lived through got them closer, they totally changed.
I am also one of those who would say "Kuririn" because of certain events. But on the other hand, Bulma's significance in Goku's life cannot be denied. Surely that can be said about all of them but Bulma has an even greater impact when it comes to the event chain simply because she was important for so many things from the very beginning. Piccolo and Vegeta, especially Vegeta, are a good reason for Goku to continously train or even are shown to be completely trusted by Goku who had no problem with Gohan being trained by Piccolo (even in that early state of Piccolo's development).
It really depends. They are all so important. When it comes to scenes that immediately show the depth of their friendship then I would say Kuririn but I had to choose for the overall story then I would say Bulma.
"What-ifs or hypotheticals" can be used here whenever. Bulma and Goku's relationship is existent, no matter how it is shown. And it is shown to be a friendship good enough for the conclusion that he definitely wouldn't just ignore her being killed such as Kuririn was. And yes, it is very well defined as much as the relationship as most. You need to look at a bit more information than just the most direct comments, that is also important.B wrote:You can speak in what-ifs and hypotheticals all day long, but the fact is Goku and Bulma's relationship is never scrutinized to the level of most of the male cast.













