How does Fl4k's "All My BFFs" skill work?

Solution 1:

The "All My BFFs" skill provides a percentage of your total health regeneration to all player characters that you're currently playing with. You still retain all of your health regeneration.

I use to main Fl4k for co-op, and this was one of my main must-have skills. I can confirm that this includes all sources of health regeneration across skills and gear. I can also confirm that this does not affect your own health regeneration - it's not split up. You retain 100% of your health regeneration.

We were able to confirm that this did not affect non-player characters; and it did not appear to affect other player characters pets. We did not have many occasions where we could test this out, so I might be off on that one. There also didn't appear to be any proximity-related requirements; my mate could be on the other side of the map, and still benefit from my health regeneration.

As a side note, it is possible to stack the skill up to 100% shared regeneration, using additional skill points from a class mod.