Jaco the Galactic Patrolman is a wonderful little comic, that has plenty of charm to offer. The characters are fun, the tale is simple, but it works and the comic has a likable feel to it all. I recommend reading it, even if you aren't keen on Toriyama's other works.
Dragon Ball Minus is a short prequel chapter to Dragon Ball included in this manga, it's a nice little tale that adds to the Dragon Ball mythos. While I'll admit it's a bit rushed (possibly to avoid contradicting the anime special, which is partially canon it seems) the story illustrates a cute look of Planet Vegeta's beginning of the end, which I admit shouldn't feel like a cute story. Still, I thought it was a nice look at what the saiyans were like before their demise, so recommended only for diehard Dragon Ball fans.
Regarding Jaco's reason on Earth, by the end we find that out and while that epilogue chapter is fine, it's a bit too much fan service. You see, Jaco was sent to Earth to stop an evil alien from arriving, Jaco's guess was that the alien would be an infant, because Earth is weak and the Saiyans usually don't send adults to weak planets. Yup, this is a tie-in of sorts to Dragon Ball, which isn't too surprising as Jaco would go on to appear in Dragon Ball Super, it's a nice connection, but there's still too much focus on the references by this point, it can be a bit distracting. I say distracting, because we soon find out that Tights is Bulma's sister, which makes her design similarity forgivable, but it's a last minute reveal that both hurts and adds to the story. I like the idea of connecting the two stories, but the flow is interrupted for shout outs to the more well-known Toriyama story, which is cute, but makes the last chapter a weak point for the story, easily put, if you disliked Dragon Ball, this last chapter will annoy you, even if you do like it, you may find that you'd rather they condense this finale to feel more like a proper ending.
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Written by Octaviano Macias