Read the latest manga One Piece Chapter 1177 English at Manga Scouts. First of all, harald wasn't reversed, he was being controlled and amped.
This is why he didn't recover his injuries after dying. So no, he's not
alive. Notice how the ground never flipped around harald. That's the
visualnclue of the reversi, like in the tabletop game.
Second, notice how brogi is still missing a arm. You don't heal, you return to the stste before the reversi. Rocks returned to how he was before being reversed too, meaning in the state he was after imu literally impaled him. He was still alive and his body didn't have the holes garp and roger inflicted, but he was tired from all the previous fights and didn't have time to recover before fraudling arrived. I am calling it out right now. One Piece 1177 - Read One Piece 1177 Page 2 of Elbaph Arc. What do you think will happen in one piece 1177? Read One Piece manga online, One Piece ready to be read in english online.
Second, notice how brogi is still missing a arm. You don't heal, you return to the stste before the reversi. Rocks returned to how he was before being reversed too, meaning in the state he was after imu literally impaled him. He was still alive and his body didn't have the holes garp and roger inflicted, but he was tired from all the previous fights and didn't have time to recover before fraudling arrived. I am calling it out right now. One Piece 1177 - Read One Piece 1177 Page 2 of Elbaph Arc. What do you think will happen in one piece 1177? Read One Piece manga online, One Piece ready to be read in english online.
One Piece 1177 Manga - 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

One Piece 1177 Scans - 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
The hammer may be loki’s but usopp would be able to lift it, summon it and use it whenever he wants. This would make him as valued as any prime fighter/elder/big name in the eyes of all residents of elbaf. Thus, making him a seafarer/pirate/pirate captain who even the giants follow. The domi reversi can only be undone by someone who's also under the same spell.Even if I'm wrong on this, I imagine this is setting up for a future moment where zoro and sanji both get put under the spell, but they just end up fighting each other and changing each other back to normal like dorry and broggy. I like the thought process. Just "Killing" as a solution might be not that simple. If rocks curse was of the same nature as the domi reversi spell there might be some more different specifics about it.
For instance, rocks asked garp and roger to free him from his curse in their mind. Maybe you have to wish for your sacrifice while it also have to be answered and accepted by someone who mutually is willing to sacrifice their life similar to what rohger and garp did (knowing that final blow might end their life if they will be out of energy and rocks would still move afterwards).
Since doggy and brogi were willig to sacrifice themselves, too, it might come down to absolute conviction or something like that.