What do you think he'd be like as a pony? I'm thinking he'd work as an archeology pony, whose hobbies include LARPing and teaching the Lindy Hop on weekends. His coat should be beige, obviously, and for his mane, I'm thinking a dark wool gray. Now, his cutie mark, I'm usually not too fond of OC ponies with weapon cutie mark (it just screams dumb Marey Sue), but I think in Lloyd's case a weapon cutie mark would be more than justified. Maybe an ancient shield and gladius? Make them look sort of knicked and dusty, so as to emphasis the fact that he's an *archeology* pony. If Hasbro ever wanted to use him for the show, he could also have an alternate, G-rated cutie mark: a pair of dancing shoes.
One ongoing gag could be that he's a serious academic archeologist, but he gets frustrated because all the other ponies in Ponyville think his job is full of action and adventure, like Daring Do. Like, maybe the Cutie Mark Crusaders ask to come along on a dig with him, so they can try and get their cutie marks in archeology, and they're all, "so do we get to fight mummies, and dodge boulders and poison darts?" And he's like "NO! We don't do any of that stuff. We're going to examine pottery shards and painstakingly catalog any rubbish fragments we find in ancient middens."
So they get to the dig site, and as they're poking around, BOOOOM all these undead monsters start popping out all over the place! Lloyd sighs, rolls his eyes in frustration, and SLASHHO starts shanking the piss outta all the zombies with this badass spear he rips from the hoary hooves of Akhen-heter the Destroyer. And when the last of the hellspawned beasts has crumbled into ash, the Cutie Mark Crusaders are all standing there looking at him, jaws dropped to the floor, like WOW, that was, but I thought you said... and Lloyd gets huffy and exasperated, and is all like "Stop gawking and pick up a brush, you Cutie Mark Crusaders; we've only got twelve hours of decent light left, and those partially-obscured 3rd century murals won't dust themselves off!!!"
So then the gag becomes that Lloyd really IS like Daring Do, it's just that he hates being bothered by all the traps and monsters and cloppy excitement, and would rather just skip straight to his real job, which is doing research and meticulously excavating ancient sites.