From "Mobile Suit Gundam F91," the F91
I haven't seen the anime yet, but it's a small prototype mobile suit from the future, U.C. 0123.
Unlike previous Gundams of the Universal Century, it was developed by SNRI (Naval Strategic Research Institute).
It has a beam shield on its left arm, giving it an asymmetrical arm silhouette.
As the era has advanced, even its shield and bazooka are beam weapons.

"Small Gundam" (various theories exist) | いり's Gunpla works