Charlotte Morningstar, more commonly known as Charlie, is the Hellborn princess of Hell, the founder of the Happy Hotel, and the main protagonist of Hazbin Hotel. The estranged daughter of Lucifer, Charlie wants to do right by her kingdom and find a way to redeem Sinners into Heaven through rehabilitation at the Hazbin Hotel.

Charlie is compassionate and empathetic to a fault, feeling genuinely upset at the idea of harm coming to others. Although she isn't unaware that Hell is populated with souls that have committed egregious acts in their living lives, she still views their yearly extermination as a senseless waste and makes it her personal mission to help them avoid it via self-betterment and eventual redemption, something she is seemingly alone in believing is possible. Charlie's idealism, while setting her apart from many of her hell-born peers, can also make her naïve to many of the harsh realities that appear to stand in the way of her potential success - something her girlfriend, Vaggie, tries to remind her of, only to be cheerfully ignored in favor of a more blinkered, sunny optimism. This can also cause her to rush headlong into the initial stages of her plans without much preparation. Charlie has a love for musical theatre, song, and dance, and will often convey her emotions and ideas through show tunes and ballads. Despite being sweet and lacking 'street-smarts', this doesn't make Charlie a pushover or stupid. When people insult her or openly mock her ideals and plans, she has no hesitation in standing up for herself, or even rolling up her sleeves to physically fight back. She is also not above letting a few cuss words slip.