(Funny Trope) Character is completely immune to another character's powers for a very specific reason

[u/Vast-Tangerine-6771]

Teodora vs Ghost of Medusa (Legend Quest)

Medusa (who as a ghost can only petrify other ghosts) failed to petrify Teodora because it would be later revealed that Teodora isn't actually a ghost but instead an astral projection

Usopp vs Perona (One Piece)

Usopp can't be made depressed by Perona's hollows because he's already depressed giving him the upper hand that no one else has

[u/greedyrabitt]

this also doesn't cover however long she was in the ocean after she was freed from the mirror (which happens pretty damn soon AFTER she was freed iirc)

some other gem named Jasper (I think) tried to fuse with her in an attempt to attack the surviving Crystal Gems. instead of allowing Jasper to hurt them, she accepted the fusion and became Malachite, who was then dragged into the ocean and imprisoned by Lapis's water powers

Lapis willingly kept Jasper locked in that fusion and trapped in the ocean for a very long time

it's been a while since I've seen it, but iirc the fusion broke at some point and Jasper hunted Lapis down again later to beg/threaten her to fuse again just because Jasper loved how strong fusion made her feel. it didn't work out

[u/RandomGuy9058 → u/greedyrabitt]

note for the non SU fans that Malachite as a fusion is also an allegory for an abusive relationship.

it's no wonder that even while the rest of the crystal gems, many of whom experienced firthand the horrors of total war, were brought to their knees, Lapis was able to stay standing

[u/TheMonocleRogue → u/RandomGuy9058]

Also raw malachite is poisonous and can leech into water if submerged due to containing copper hydroxide crystals. It has to be polished before it can be handled safely.

Whoever wrote the characters did their homework.

[u/Separate_Animator110 → u/greedyrabitt]

You remember correctly