1: Wrench
It was a given; when you were a former student of Ratchet, you threw a wrench at a patient at least once in your life. This was given. Truth. Indisputible fact. Everyone knew this, from the lowliest Decepticon (generally thought to be a mech by the name of Shutter, who turned into a cammera, of all things. Fairly useless, really, because who needs a cammera when you've got Soundwave?) to Primus himself. It was undeniable. First Aid threw his first wrench at Bluestreak. It was a curse, some argued.
Therefore; it was no surprise when, one day, Swoop, in a fit of rage, threw a wrench at Grimlock, knocking his eldest brother offline before dragging him off to the medbay.
2: Tough Slag
If you asked any Autobot to describe Slag in one word other than 'stupid', it would be 'tough' that they chose. it was a reputation he prefered to keep, so he mostly kept his usual Friday night activities to himself (though Prowl knew- the bastard knew everything though, so why should Slag care?). Every Friday, at exactly 9:35 PM, the second in command of the Dinobots would sneak off the Ark with surprising skill and head to his favorite spot in the world.
The duckpond. Slag took great care of the ducks at the city zoo, and was on first name terms with the night guards, who let him in every time. It was his favorite thing to do, feed the ducks and clean the pond, and it helped him be a child for a change, which was nice.
3: Fixer Upper
Broken down vehicles were Sludge's favorite things in the universe, after his brothers and Energon and Mama Ratchet and Daddy Wheeljack. Sludge loved fixing Vehicles, be they cars or boats or planes or trains. he wasn't a medic (he didn't care about fixing robots, after all.), that was Swoop's function amongst the Dinobots. But Sludge? He liked fixing vehicles, and he was good at it.
So every chance he got, he went to 'Mort's Auto Parts Graveyard' and brought some dead cars back to life. They might not have looked pretty, but that's what Snarl was for, really.
4: Paint
Snarl considered himself an artist, not that he'd ever say it out loud. He'd learned from the best painter on Cybertron, and he was Sunstreaker's favorite student, by the yellow Lambo's admission. He loved drawing, sculpting, building (and destroying, which could be an art in and of itself, if done right, in Snarl's opinion.); but painting was his passion. any idiot could commit something to their memory banks- it took real skill, in snarl's opinion, to accurately paint a scene and paint it well.
Plus, it was fun to paint the cars that Sludge built.
5: Baseball
Those who knew Grimlock assumed his favorite sport would be Football, or Hockey, or the riots after a South American Soccor game. and the leader of the Dinobots WAS fond of them, but his favorite sport was baseball. He was a Minnesota Twins fan through and through, and had as much knowledge on them as someone following them since they were a month old could. Grimlock WORSHIPPED the team, and was always waiting for their next big win.
He always channeled Ratchet when they lost.
My, but the Dinobots are fun.
