None.

There are several gun battles and dogfights. Nothing too graphic.

The F-word is used roughly 3 times, and some other very mild cursing.

Linkara and Allen go to a bar. Linkara is obviously drunk in one scene.

Mechakara is a very intimidating villain and may be unsettling to squeamish viewers... especially when he pulls off his own face. His robotic form may be even more unsettling.

Linkara loses faith and hope in his life and develops an existential crisis. However, he is eventually able to get over it.