Hong LuThe Lord of Hongyuan

His S3 chooses one of his Heishou allies, then after his attack, makes them use their S3, after which he uses his S3-2 comboing with the chosen ally. The chosen ally cycles among all active Heishous in deployment order. After this, the chosen ally gets a persistent offense/defense level buff and he gets a persistent buff depending on the ally chosen. If he can't use his S3-2, he uses his S3-3 instead, which is a slightly stronger version and can gain Atk Weight if at least 3 Heishous have died.

Using his defense skill buffs Heishou allies with a Slash Power Up and causes the Heishou ally with the least HP to use their S1 as a follow up skill if his counter is triggered. That Heishou ally also heals 10% HP and retreats at the end of the turn. If there are no backup units, they get 2 Attack Power Up instead. Note that they are placed in front of non-Heishou units in the return order, but behind backup units that haven't entered combat yet.

Whenever an ally enters combat whether from backup or returning from retreat, they heal 10SP and use their S1 for free at combat start. For Heishou or Jia Family units, they heal 20SP and use their S3 instead.

Gains Leash-holder of All Heishou at the start of the battle, which gives him bonus speed, damage, Defense Level Up, and Offense Level Up depending on how many Heishou identities were deployed (including Backup sinners). Whenever a Heishou unit dies, he heals SP and gains a stack of Life from Death [死中求活], which gives him even more Offense Level Up, Damage Up, and Attack Power Up.

Using his S3-2 gives him a stacking Heishou Bolus Contamination [黑獣丸染] buff depending on which Heishou he comboed with plus a bit of bonus damage per active buff. All the buffs can be active at the same time:
[Yi Sang] Heishou Pack - Wu Branch Adept: Tremor Burst on the final coin of an attack skill (once per turn).
[Faust] Heishou Pack - Mao Branch Adept: -5% damage received.
[Don Quixote] Heishou Pack - Wei Branch: inflict 1 Sinking when inflicting Rupture (3 per turn)
[Ryōshū] Heishou Pack - Mao Branch: +5% damage against slower enemies
[Heathcliff] Heishou Pack - You Branch Adept: deal 5% of damage as damage.
[Rodion] Heishou Pack - Si Branch: inflict 1 Rupture on critical hit (3 per turn)
[Sinclair] Heishou Pack - You Branch: inflict 1 Burn when inflicting Rupture (3 per turn)
[Outis] Heishou Pack - Mao Branch: inflict 1 Rupture Count on hit when unopposed (1 per turn)
[Gregor] Heishou Pack - Si Branch: gain 1 Poise Count when dealing Rupture damage (1 per turn)

When his passive is active, he applies Lordsguard to 1-2 Heishou allies based on Reson (1 at 3 and 2 at 6 Reson) on turns where he doesn't use his defense skill. If he takes an unopposed attack, allies with the status redirect that attack to themselves and use his second defense skill (the clashable guard) on it.

His passive allows him to interact with [Hong Lu] Tears of the Tarnished Blood [汚血泣淚], gaining Tarnished Blood instead of dying the first time his HP drops to 0 and converting [Hong Lu] Tears of the Tarnished Blood [汚血泣淚]'s death effect to a 60% HP heal once per encounter. He also gets a permanent Damage Up when that triggers.