My reference for Boba has always been OG trilogy. Empire and Jedi. That's it. Yes there's been so much we've seen in different versions but my main go to for what the character could be is those movies is right there. And that includes the original Jason Wingreen voice. So before anyone gets at me with UUUHHH ACTUALLY IN THE KAY-BE TOYS EXCLUSIVE COMIC...I'm just talking about the original unaltered films. So everything up to "when we got to see him as a little kid!" I do not count...or I choose to ignore.
And there, in that universe he is most certainly a baddie. Key take aways proving this.
-When we first meet him on the bridge of the star destroyer Vader looks at him & says specifically to him. "No disintegrations" implying that he has done this before.
-When Chewbacca is freaking out and killing stormtroopers Boba Fett aims his rifle directly at him. So much show that Darth Vader grabs it. (And if Darth Vader grabbed your gun...you must def be messing up. ) But this once again showing he has no qualms ending the wookie right there.
-Boushh pulls the thermal in Jabba's court, again Boba has no problems blasting them right there.
-Boba attempts to capture Luke, Luke resists..Boba attempts to shoot Luke.
Seems pretty cut and draw what his intentions were in the OG trilogy.