Princess Peach has appeared in nearly all of the Mario spin-off titles. Since the first Mario Party, Peach has appeared in every single installment, including Mario Party Advance. However, like all Mario Party games, she has nothing outside appearance and voice to set her apart from other characters. An exception to this is Mario Party 7, in which both Peach and Daisy can use the Flower Orb as their special orb (that is, no other characters can receive it at orb spaces or shops). She is also in Super Mario Galaxy 2 when Bowser kidnaps her and puts her in the center of the universe. Mario and Peach then get the Grand Star, before the Comet Observatory from the first Super Mario Galaxy shows up, and Rosalina is heard thanking Mario for watching over the Luma that he had found. The Luma returns to the Comet Observatory, taking Mario's cap with him, before the Comet Observatory transforms into a comet and leaves. Eventually, Mario and his companions return to the Mushroom Kingdom, where a large cake stands in front of Peach's Castle and Starship Mario sits in the sky above.

In the Mario Kart series (except Super Mario Kart and Mario Kart 64), she is in the medium category of characters with the fastest acceleration, the lowest top speed, and the best off-road ability to take the shortcuts on each course. Her special item in Mario Kart: Double Dash!! involves two hearts temporarily rotating around her kart, giving her whatever item they collide into. She shares her special with Princess Daisy who is supposedly her sister as stated in the Mario Kart Wii official guide, but nonetheless, she is still her best friend.

In the Mario Tennis and Mario Golf series, she is labeled as a "Technique" character and has one of the lightest hits. She is a captain in the games Mario Superstar Baseball, and Mario Super Sluggers and specializes in pitching. She is a playable character in Super Mario Strikers and its sequel, Mario Strikers Charged. Peach is fast, agile, and has good passing skills. Finally, she appears in the first Mario basketball game, Mario Hoops 3-on-3, for the Nintendo DS, and is a technical type (good at taking shots). She appears in the crossover sports game, Mario & Sonic at the Olympic Games, where she is a skill type character.

In the Super Smash Bros. series, Peach first appears in Super Smash Bros. Melee, the second game of the series. She has the unique ability to float for seconds, much as she can in Super Mario Bros. 2, an advantage which is balanced by the fact that she is one of the lighter fighters and in Super Smash Bros. Brawl her killing ability has been decreased since Super Smash Bros. Melee and making kills in Brawl can prove to be quite difficult. However, Peach's Float is one of the main elements of her game, as it allows her to combo players from above and dodge horizontal attacks. It serves as an amazing horizontal recovery. Her attacks include the Peach Bomber (where she leaps forward, twirls and rams her butt into her opponent which causes an explosion); her forward grab (a massive slap that kills players at higher percentages); her parasol; using Toad as a human shield; using golf clubs, tennis rackets, and frying pans as melee weapons; and pulling turnips from the ground.

In the cartoon series by DiC, she is always referred to as Princess Toadstool, since the name Peach had not been used in the western world, and she had red hair. This may have been due to the original NES games depicting her with red hair, due to technical limitations). Unlike in the video games, she is occasionally seen using power-ups such as the Raccoon Leaf. She is voiced by Jeannie Elias in The Super Mario Bros. Super Show! and Tracey Moore in the two follow up series, The Adventures of Super Mario Bros. 3 and Super Mario World.

Peach has made cameo appearances in non-Mario games as well. She is a playable guest character in the GameCube ports of the Electronic Arts games NBA Street V3 and SSX On Tour. Peach made a minor appearance in The Legend of Zelda: Ocarina of Time, in a painting in Hyrule Castle. A Princess Peach kart toy appears and can be driven in the Labrador and Friends version of Nintendogs. Peach made a cameo in The Legend of Zelda: Link's Awakening, appearing in a picture sent to Mr. Write from the goat in the animal village. The photo is of Peach with the name "Christine" written underneath the picture. She appeared at the King Dedede battle arena in Kirby Super Star, as well as in the mini-game Megaton Punch. In Kirby Super Star Ultra, she is once again seen at the Dedede arena. Her crown appears in Pikmin 2 as an item to be collected, although it is labeled "Unspeakable Wonder".

Princess Peach has been praised by critics. GameDaily described her as an “ideal woman that's as sweet as can be” in their list of babes that should or shouldn’t meet your mom. The website ranked her forty-eighth in their list of Top 50 Hottest Game Babes claiming that she is “the quiet 'quick, come and rescue me' type, but in Mario Strikers Charged she's all action with a sexy sports outfit and shows the boys who's boss”. IGN editor Matt Casamassina stated that Nintendo prudes would be "taken aback" by her outfit, which he describes as more revealing than any outfit she's ever worn. IGN rated the character an 8 out of 10 in the worth saving index on their article “Mario’s Ladies: The Princesses of Mario Galaxy”. The New York Times claimed that Princess Peach had “grit as well as grace” and that her “peachiness did nothing to upset the apple cart of expectation: she may have been athletic, smart and strong, but she was also adorable”. The article claimed that Peach was what “once-unisex, postfeminist parents are shooting for”. In a poll conducted by the Official Nintendo Magazine, Princess Peach was voted by readers as the second greatest female character; the magazine stated that "some might view her as being a bit useless but we'll let her off as rescuing her is always so much fun". Peach was included on GameDaily's list of hottest blonds in video games; they cited her appearances in sports games such as Super Mario Strikers and SSX On Tour. They listed the "damsel in distress" as one of their top 25 video game archetypes, using Princess Peach as an example of this due to her frequent kidnappings. The Game Reviews editor Mark Fujii listed Peach as one of their "top 10 video game women who don't use sex to sell", citing her playable role in Super Mario RPG: Legend of the Seven Stars. He describes her as a "force to be reckoned with" in spite of her attire.

On the other hand, Peach has faced some criticism. GameDaily named her in their Worst Video Game Girlfriends list, citing that her “fatal flaw is her chronic inability to not get kidnapped by Bowser, leading our favorite plumber to, time and again, have to risk his neck in order to save her”. The same website had named her one of the worst Mario characters, stating that she “knows her boyfriend will come and save her” and that she was a “total drama queen”. GameSpy, in a humorous article, called Princess Peach “the worst woman in gaming” claiming that she is a “woman of immense potential power who refuses to use any of it”. The website stated that she was “neither a feminist nor sexy” and criticized aspects of her character, including her wardrobe and her position as a ruler. IGN stated that, although she proved her worth in games like Paper Mario and Super Princess Peach, Peach is "the most danger-prone moron the world has ever known".