Incineroar? Or Zarude if you prefer going away from the norm~
Exveemon? Or MetalEtemon if you prefer going away from the norm >w>

Hehe sounds fair since the norms are often renamons and charizards right? :p

I mean those too haha, but the first ones of each I gave are very popular as well x3 The second ones of each are more obscure picks I barely see around!

Hehe true, it is not often the metalEtemon gets used in arts

The Dorugamon line never gets enough love, and Dorugreymon makes a good actual dragon if you're looking for one of those and don't want to use Salamence.

Strikedramon also might make a good macro.

Macro blastoise.
Macro gabumon.

Digimon, definitely growlmon 👀 I'm not biased, I promise

How about Dynamaxed Zacian/Zamazenta?~ Its different, in that their normally not able to, and its a win, cause big sword/shield wolves. But seriously.

Pokemon suggestions: Vulpix/Ninetales, Growlithe/Arcanine, Houndour/Houndoom, Eevee/Any Eeveelution, Zacian/Zamazenta, and finally for suggestions of Pokemon Kor/Miraidon

Digimon: Guil/Growlmon, Gururumon (Its not GArurumon, its GUrurumon~), Devitamamon, MarineAngemon, Plesiomon, Nanimon, Youkomon/Doumon (Not the same as the normal renamon line after all~), Meramon

It would really depend on what they are doing and to whom. But if you need a quick idea for a warm-up, you could do a The New Empire tie-in and pair Slaking with Nidoking.

Or even better: Have them "fighting over the crown", but the twist is that they're both normal-sized and fighting Smash Bros. style on top of a macro Slowking. They would literally be fighting over the crown).

Ninetales or vulpix
Also are none pokemon /digimon suggestions fine?

Jumping Jackal from Dragon Quest series with a belly and the new human walking form of Red XIII with a belly, plus I would love to see you as a donkey chubby as well please?

dig up the REALLY obscure characters, and Doma-ize a MONSTER RANCHER mon. there's some very neat ones in that IP, that seems to have been buried under the other two games. also, a macro giving actual Kaiju a hand.