All enemy only weapons:
Hoshido
Katana:
Iron Katti
Steel Katti
Silver Katti
Naginata:
Iron Nageyari
Steel Nageyari
Silver Nageyari
Clubs:
Iron Mace
Steel Mace
Silver Mace
Yumi:
Iron Hankyu
Steel Hankyu
Silver Hankyu
Skadi
Nohr
Swords:
Iron kukri
Steel Kukri
Silver Kukri
Lances:
Iron Javelin
Steel Javelin
Silver Javelin
Axes:
Iron Star Axe
Steel Star Axe
Silver Star Axe
Bows:
Iron Short Bow
Steel Short Bow
Silver Short Bow
Staffs:
Entrap (The infinite range one)
Misc:
Shackled Fist
Gauntlet
Rock
Massive Rock
Dark Breath
Invincible Breath Both Forms
Saw
Big Saw
Dragonic Rage
Astral Breathe
ALL BOSS WEAPONS
Skills that get you shadowbanned:
Dragonskin
Freeze
Status Resist
Wing Shield
Divine shield
Status immunity
Infinite staff
Point blank
Bold Stance
Nihilistic Curse
Negative Chains
Self Destruct
Paragon (Query)
All stat-takers (Query)
Class limitations:
-Anything illegitimate on Kamui (No animal-spirit classes, for example. The rules for Kamui include the rule below, but the inverse is not true.)
-Any enemy or Lillith class on anyone (Astral Dragon, Invisible Dragon, Dark Lord, Faceless, Golem, probably some others)
-More than allowed (math it out) amounts of Dark Prince/ss, Darkblood, Whiteblood, NTF, and Managarm.
I think it maths out to 2 non-Kamui Dp/DB/WB if you don't marry, 1 if you marry to a second gen or are playing as Male Kamui and marry anyone but Aqua, and 0 if you marry to a first gen as Femui. Kamui, Kanna and Kanna's sibling (if existant) count towards this cap EVEN IF THEY ARE NOT CLASSED to it at the time.
If you marry Nishiki to Shigure, then Kinu or Shigure to Kamui, you can get a total of 4 (Nishiki, Kinu, Shigure, Kanna) NTFs. So with Nishiki/Kinu ONLY, you can use 2 other units as NTFs. Same for Managarm.
src