My favorite thing to grill is Yakitori. You can use any type of protein like steak, chicken, pork, or even tofu and put it on a stick. Veggies like asparagus, scallions, baby bok choy, etc. are also good. For a good grill marinade & dipping sauce you can use a blend of soy sauce, brown sugar, chopped scallions, and fish or oyster sauce to get some moistness and caramelization.

You should also dry-brine your meat for peak texture about 1hr before for best results. saltyourmeat.com is a good resource for exact numbers