This page of our guide to Life is Strange True Colors contains a description of all the important choices in Episode 3 and their consequences.
Hitting on Diane
This important choice will occur at the very beginning of Chapter 3. You will meet Steph and Ryan at the bar. Your task will be to choose who's going to pick up on Diane to distract her.
Choice: You can choose Steph or Ryan.
Consequences: This choice will not affect Diane in any way. She's gonna react the same way to Steph as she does to Ryan. However, the choice will affect your relationship with the one you choose. Whoever you pick will become much closer to you.
This important choice will occur at the very end of Chapter 3. After the LARP, go to Charlotte to talk to her. With your powers, you will see how much she suffers and how much she hates herself.
Choice Leave Charlotte alone or take away her anger.
Consequences: If Alex takes Charlotte's anger away, she will burst in front of Steph and Ryan. Because of this, Steph and Ryan will leave the apartment, and Alex will examine the flash drive herself. During the festival in Chapter 4, you will meet Charlotte, who will tell you that she is not feeling well and is having a hard time feeling any emotions. In Chapter 5, she won't be on your side.
If Alex leaves Charlotte and doesn't fight with Steph and Ryan, then in Chapter 4, Charlotte apologizes to her. She'll eventually be on your side in Chapter 5.