Talk:Princess Celestia/@comment-1031724-20190508040741

An interesting theory I heard about Celestia is that she only became as lighthearted and fun-loving as she is AFTER Luna returned. There are two things to support this.

First, Discord referred to Celestia as "grim" and "boring" in The Return of Harmony. This could be dismissed because he had just been released from a thousand-year imprisonment, where Luna was unfamiliar with how the present day seemed to work after being imprisoned for almost as long, and Celestia was rightly displaying anger at the chaos he caused.

Second, however, is in Forgotten Friendship, where Sunset Shimmer, who presumably left Equestria not long before Twilight became Celestia's student, is surprised that Celestia has a sense of humor, implying she didn't when she knew her.

It would also explain why Twilight is often so nervous about disappointing her and what she might do to ponies who offend her, and why she's freaking out even when Celestia herself was the cause of the tea overflowing.

But she didn't seem any less kindhearted in the flashback to Twilight getting her cutie mark. So obviously most of her personality was the same, getting her sister back probably made her so overjoyed it added a more fun-loving side to her.