Advice to Play Asshimar
Use your mobility to your advantage. You get out of most tricky situations or flank phenomenally with your transform, and your grenade is an excellent area denial tool.
Try to hit headshots with the burst rifle, but firing into a crowd works too. Avoid enemies like Barbatos, Zaku II, and Dom. Enemies without a shield, but aren’t incredibly fast are your prey of choice, and burning through enemy shields with the rest of your team is an excellent choice.
Just be sure to use your height and mobility to your advantage, and avoid protracted fights because you are kind of squishy. Stick with bigger teammates like a Sazabi, Gundam or GM and you’ll be fine.