SFS Standard Mount Feat 5

Source Galactic Ancestries pg. 9
Prerequisites Large size or larger
You are proud to serve as a mount for your trusted allies. This might be a natural development, or it might be the result of intense training to ensure you can operate as a mount for your allies.
When another PC rides you as a mount, your expert coordination allows them to gain three actions at the start of their turn rather than the two they normally would for riding another PC (page 11). You still gain only two actions at the start of your turn instead of three, however, as you spend the third action keeping your ally balanced on your back and ensuring they're firmly mounted.

Standardized Ancestry Feat

This feat replaces its Ancestry trait with the trait of your ancestry. Full rules for Standardized Ancestry Feats are here.

Riding PCs

A PC can ride on another PC if the second PC is at least two size categories larger than them; this might be a Tiny novian in their osharu teammate's backpack, or it might be a leshy on an urog's shoulder. However, doing this requires a tremendous amount of coordination to ensure the smaller PC doesn't get in the way or that the two PCs don't jostle each other into losing actions. As a result, for most parties, this tactic is less favorable than the smaller PC just using a vehicle. If a PC who is at least two sizes smaller rides along with another PC or with a similar non-minion intelligent creature, roll both for initiative but use the lower of the two results. The two PCs act in either order on the same initiative count. While traveling in this way, the PCs each gain two actions at the start of their turns instead of three, since the larger PC must spend one action keeping the smaller PC balanced on their back, and the smaller PC must spend one action maintaining their grip.

Some ancestries specialize in being able to carry smaller riders or have feats to enable this, such as the Mount feat.

Traits

Ancestry:The ancestry trait is used on standardized ancestry feat options, and represents whatever ancestry your character is.