Building a "Human Shadow" Halfling...

[VoodistMonk]

What is the best way to use the Human Shadow alternative racial feature available to Halflings?

I'm too lazy to link it, right meow, but it allows said Halfling to make a Stealth check when behind a larger creature. Being behind another creature normally grants soft cover... soft cover does not allow one to normally make a Stealth check. Fun stuff.

There are several methods that allow one to upgrade soft cover to hard cover... Auspacious Birth (eclipse) and the Castling cRogue Talent both immediately come to mind... and most that I know of, including both I mentioned, include language saying that this newly upgraded hard cover is not enough to use Stealth. However, our Human Shadow Halfling could benefit from something that upgrades soft cover to hard cover, AND still use Stealth. With access to cRogue Talents, one could also apply the hard cover bonus to Reflex saves to their Fortitude saves via Fortified Position... and make immediate action Stealth checks via Evasion/Without a Trace.

Anyways, what are some good builds that specifically use Human Shadow Halflings?

Teamwork feats? Combat Reflexes/Bodyguard and the Helpful trait? Other things that might benefit from someome consistently adjacent?

[Wonderstell]

Human Shadow:

Halflings seem to pop up wherever humans are found, in part because they actively support and move with human explorers, settlers, and travelers without drawing attention to themselves. These halflings can use Stealth to hide behind creatures at least one size category larger than themselves, without any other source of concealment or cover. As long as the halflings are within 30 feet of a human, they gain a +2 racial bonus on Sleight of Hand checks and Stealth checks. This racial trait replaces keen senses and sure-footed.
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It's essentially a conditional 1st level HiPS so any playstyle that wants to use stealth (or moves often) benefits a lot. Especially low-lv builds. The drawback is of course that any intelligent foe can easily deduce where you are hiding if you use it during combat.

Sniping builds and those using False Attacker (rogue talent) can obfuscate where they're firing from, while a caster in the backline may not care that enemies know the general location.

Buy a riding dog, be a stealth archer. Lots of ways to use the ART.