You might check them out first as there is some blood and violent imagery in it, like a PG-13 level I’d say, so I don’t want to blindly recommend something you don’t want your kid to read depending on his age and your parenting guidelines, but I’ve read the first trade volume (issues 1-6) of the brand new Transformers comic series by Image Comics who got the IP’s comic rights recently, and the comic slaps. I’m especially happy as a Starscream fan, he’s vicious, backstabbing, selfcentered, a big loudmouth, they nailed depicting my favorite Decipticon.
While the issues so far are totally readable on their own, they do tie into a larger universe Image has made called the Energon Universe.
Void Rivals, by Walking Dead comic writer Robert Kirkman, follows two alien robots, each from a faction at war with each other, who are stranded on a planet foreign to them and have to work together to survive. They’re not Transformers but certain moments tie into the Transformers comics’ events. There’s also the various GI Joe miniseries, each focused on a solo Joe hero or villain like Duke or Cobra Commander, that are also set in the universe (an ongoing GI Joe main comic is starting soon IIRC), and also a certain Joe character cameos in an early Transformers issue.
But like I said, what I’ve read of it so far, the Transformers comic seems perfectly followable so far on its own. So hopefully it might be something your son could enjoy if you look into it and think the content is okay for him.