In this article I'm going to list adjectives describing Charlie/Claire and then name 5 scenes or moments which I think fit the description.

Cute
1. The invisible peanut butter scene.
2. Claire and Charlie releasing the bird together.
3. Charlie's "day seizing" picnic.
4. Their first kiss.
5. Claire cutting Charlie's hair.

Tragic
1. Charlie's death.
2. Charlie saying goodbye to Claire.
3. Their separation after Claire learns about the drugs in Charlie's Virgin Mary statue.
4. Charlie missing Claire after her abduction.
5. Claire not remembering Charlie initially after her abduction and escape.

Protective
1. Charlie sacrificing himself to get Claire and Aaron home.
2. Charlie killing Ethan.
3. Desmond revealing that Charlie would have died saving Claire from drowning.
4. Charlie saving Aaron when Danielle abducts him.
5. Charlie looking after Claire when she's ill.

Endgame
1. Charlie and Claire's reunion and kiss in the flash-sideways.
2. Charlie recognising Claire in the audience.
3. "A woman. Blonde, rapturously beautiful. And I know her. We're together. It's like we've always been, always will be."
4. "The night I met you" being Charlie's #1.
5. Charlie leaving his DS ring with Aaron.