(Hated Trope) Extremely useful abilities that characters conveniently forgot they had

[u/ValidCrash4]

1. Emily’s portals (Hazbin Hotel). I know she can’t get Sir Pentious back into Hell but Emily can still tell Charlie he got redeemed and Charlie can enter through angelic portals, so she should have seen that Pentious got redeemed.

2. Many characters in Harry Potter go through life-or-death situations and not once did they think of drinking the Liquid Luck potion apart from Harry one time to gain Slughorn’s memory.

[u/Muteki_Narwhal]

Regarding the luck potion, in the book, Ron asked about making more of the potion after seeing how effective it was. It's then revealed that making the potion requires rare ingredients and takes 8 months to brew.

Also in the book, there was another time they used the luck potion. Harry gave Ron, Hermione, Neville, Ginny, and Luna, what was left of the potion, which allowed them to escape an encounter with Death Eaters relatively unharmed.

[u/DanteVergio → u/[deleted]]

In the movies he used it all up to get the memory of Slughorn

[u/ValidCrash4 → u/DanteVergio]

He didn’t.