What are the choices again? (spoiler possible)

[Texus]

For the right ending?
I mean when does it get important again? I feel like i can do almost everything I want the first time honestly, but I saw something about 100% in two playtroughs?

Is there really something like 100% or did they just meant the achivements?

Any new romances? I remember aditional attack types and a second Persona form I believe.
Were there new scenes including the date?
I do know that there should be new scenes for the party group.

[XenoEvil]

Don't throw the culprit into a TV. During the hospital scene, pick responses that question and brings doubt to the current situation.

[Texus]

Thank you, but don't be affraid of spoilers, I don't remember if I finished the true ending back then, but I should have played the original at least 4-5 times.

[XenoEvil]

There is the normal/good ending which is the one where you figure out who the true culprit is. On December 3, just pick the following responses:
"Wait a second here..."
"We're missing something."
"Namatame's true feelings."
"Something's bothering me."
"We're missing something..."
"Calm the hell down!"

For the true ending, you need to be on course for the good ending but at the end of the game where you say your goodbyes to everyone, instead of accepting the prompt to go back home, you go back to Junes.

The golden ending is the same as the true ending with extra content. Just make sure you are on track to the good ending and have Marie's social link maxed out before the December deadline. On January 2 you have the option to go into the velvet room where a cutscene will play. Pick the following responses:
"Why did she leave?"
"Where did she go?"
"I don't care about danger. I'll go."

This will unlock a new dungeon you need to complete and you should be all set for the golden ending. Just following the instructions for the true ending and you will get the golden ending.