Lady Bow

Lady Bow is the leader of the Boos of Boo's Mansion in Paper Mario. She is aided by her butler, Bootler. She is very strong-headed and a tad snooty due to her princess-like status in life, but is also kind-hearted in wanting to aid Mario so that he can save Peach and the world's wishes. She can slap enemies with both her hand and, when ultra ranked, her fan. She can also protect Mario from attacks with her Outta Sight attack and, at super rank, can also try to scare away enemies with an ability called Spook. Outside of battle, she can turn Mario invisible, protecting him from enemy attacks. However, Mario cannot move while in this state.

Paper Mario
Bow joins Mario after he solves the puzzles of Boo Mansion. The main reason that she joins him at first is because she needs him to help stop the ghost-eating boss Tubba Blubba. Bow, who was holding Skolar prisoner, agreed to give him to Mario if he helped her. After Tubba Blubba was defeated Bow remained true to her word and gave Skolar to Mario. She then decided to accompany Mario ("like it or not") for the rest of his adventure.

In Chapter 4, Lady Bow is referred to in a scribble by a Boo from Boo's Mansion, who is crazy about Bow and thinks she is arrogant and headstrong. At the end of the game, a Boo from Boo's Mansion, maybe the one who posted the scribble, came to the party "to see Lady Bow dressed up in all her finery". He also thinks that Bow is prettier than Princess Peach.

Paper Mario: The Thousand-Year Door
Lady Bow and Bootler make a cameo appearance in Paper Mario: The Thousand-Year Door. They are taking a vacation at Poshley Heights after Mario and friends save the Mushroom Kingdom. She is quite glad to see Mario again but her snooty personality hasn't changed a bit. Earlier in Mario's adventure, a young Toad from Petalburg called Bow "the cutest Boo OF ALL TIME!!!"

Tattle
"That's Bow. Wait a second! Mario! Exactly WHAT is your relationship with her?!? Tell me NOW! Hee hee hee hee hee hee! Just kidding! I always wanted to say that. But you DID go on an adventure with her, right? Tell me about it sometime, OK?"

Super Paper Mario
 In Super Paper Mario'', Lady Bow makes three cameos. Her first is at the beginning of the game; she, along with all the other partners from the first Paper Mario appeared in a photograph at Mario's house. Bow's second cameo was at Fort Francis. There is a poster of her and Bootler in one of Francis' secret, password-activated rooms. Lastly, she appears as a Catch Card in the sixtieth floor of the Flopside Pit of 100 Trials within a treasure chest.

Super Smash Bros. Brawl
In Super Smash Bros. Brawl she appears as a Sticker that raises magic attack power by eight. It can only be used by Princess Peach and Princess Zelda.

Catch Card

 * Card Type: Rare
 * Card Description: This is Mario's goody buddy Bow from Paper Mario. The mistress of Boo's Mansion slapped foes with panache!

Trivia

 * Bow's name is derived from the word "bow," which, depending on pronunciation, may mean "ribbon" (referring to the bows she wears) or can refer to a type of gesture often done in reverence to royalty. It is also likely that her name is a pun on "Boo".
 * Lady Bow is one of only two partners from Paper Mario (the other being Parakarry) to make a cameo appearance in at least two of the Paper Mario sequels.
 * Lady Bow does have some sprite data from Super Paper Mario, but she was never used in the final version of the game (other than in the form of a Catch Card and appearing in pictures in Mario's house and Fort Francis).
 * During the ending of Paper Mario, Bow is mistakenly referred to as "Lady Boo" when Mario reads the back of the news board in Toad Town.
 * Bow is the only character in Paper Mario that is incapable of doing any damage to Bowser in his powered up form. The same applies to the Crystal King, as well as the sixth battle with Jr. Troopa.