Alright so
>poise + rupture ID
S1
>gives a slight boost to Heishou Faust Assist Defense
S2
>Gluttony damage up to one ally (probably just one stack) and is probably 2 rupture count then 2 potency
S3
> "wet fart" attack that makes one ally use their S3 unopposed on the target (Heishou only)
>after the S3 and assist attack are complete Hong Lu follows up with his S3-2
>depending on what Heishou ID he did a combo attack with he gets a different permanent bonus after the attack
>if there's no available Heishou when he uses S3 he does S3-3 instead of S3-2
>that one scales off his passive that boosts him the more Heishous are dead
Counter
>gives slash power up to heishous
>retreats the lowest HP heishou
>said Heishou uses their S1 before retreating on whoever clashed the counter
>has an alternate version related to his passive that makes him redirect the attack to Heishou allies
And for the passives
>gets (likely) +1 offense, damage up and attack power up for every Heishou in the party that died (max 5)
>has a special interaction with Tarnished Blood EGO that makes him immune to the kill after use effect and heal back up instead after using it (probably up to 60% or 80%)
>also gets a power boost for each stack of the EGO's thing
>has a built in "can't die once" like Priest Gregor and BL Meursault
>every turn he applies a buff on all Heishous
>said buff makes every Heishou use Hong Lu's Defense-2 whenever he's about to take an uncontested attack so they clash it instead of letting him get hit

Wew. Lots of words.
All in all I think he's gonna be pretty fucking strong.
I predict that the way you're gonna be mainly playing him is by just spamming counter whenever you can't use a S2 or S3 because it means you can send an unopposed S1 from another Heishou to the enemy on top of dealing counter damage, unless his S1 gives him real good poise count and rupture count.