Sorry if I repeat myself, I'm copying and pasting info from different sites:
Panel de Pon is a video game released for the
Super Famicom on October 27, 1995, starring a young fairy known as Lip. However, the game didn't actually make it to the West, for the Western release,
Nintendo changed all the characters to
Yoshi characters and
enemies. When it was released in the West, it was known as
Tetris Attack. In the
Super Smash Bros. series,
Lip's Stick, an item used by Lip, is an item throughout the series.
Kirby's
Stone move can turn him into many objects including a Garbage Block from
Panel de Pon.
Panel de Pon music also appears in
Super Smash Bros. Brawl. The fairy Lip herself appears as an important character in
Captain Rainbow.
The game was updated and rebranded in September 2000 for the
Nintendo 64 as
Pokémon Puzzle League (
PPL). This version, based on the first few seasons of the
Pokémon anime, includes a training mode, a puzzle editor, and a 3D game mode that takes place in a cylindrical playfield.
Pokemon de Panepon, a Japanese remake of
Panel de Pon was localized and released in December 2000 as
Pokémon Puzzle Challenge (
PPC).
A localization of another Japanese remake titled
Dr. Mario & Panel de Pon for the
Game Boy Advance was released on November 25, 2005 in Europe, November 28, 2005 in North America, and December 2005 in Australia and retitled
Dr. Mario & Puzzle League.
Another version for the
Nintendo DS, titled
Panel de Pon DS, was localized and released in 2007 as
Planet Puzzle League in North America and
Puzzle League DS in Europe. This version includes new backgrounds and music, stylus-enabled gameplay, and the ability to play against other players worldwide via the
Nintendo Wi-Fi Connection service. Like the Game Boy Advance version, the DS version has no storyline. Another version for the
Nintendo DSi, titled
Chotto Panel de Pon was localized and released through the Shop's
DSiWare as
Puzzle League Express in North America and
A Little Bit Of Puzzle League in Europe.
n
Super Smash Bros. Melee and
Super Smash Bros. Brawl, one of the various objects that Kirby randomly transforms into when using his "Stone" (down+B) special attack is one of Lip's garbage blocks from
Panel de Pon. Also in the games, there is an item called Lip's Stick, named after the
Panel de Pon character replaced by Yoshi for
Tetris Attack. Lip's Stick poisons the opponent that it contacts, as a flower is planted atop his or her head. While some in-game graphics exclusive to the Japanese market were replaced with more recognizable items, Lip's Stick was left as-is with its trophy explaining its Japanese-only origin. Also present in
Brawl are four collectible Stickers depicting characters from the
Nintendo Puzzle Collection iteration of
Panel de Pon, marking the first time a
Panel de Pon character is intentionally shown to audiences outside of Japan. The character stickers, however, had their names translated to those of the Super Famicom characters. The red heart block is also present. The game also includes a remix of Lip's theme, which plays on the PictoChat stage. Lip also appears in
Captain Rainbow for the
Wii.
Tetris Attack was met with very positive reviews, earning a 90% average rating on Gamerankings.
[2] GamesRadar listed it on their list of "The 100 best games of all time", stating "you haven’t lived until you’ve played TA two-player and dropped an immensely satisfying five line garbage block on your opponent."
[3] Game Informer featured it on its own best games of all-time list at 96 and called it one of the most addictive puzzle games ever made.
[4]
Plus, she is already shown to not be forgotten in the Nintendog stage, look at that block.
Between Lip's Stick as a recurring item, one of Kirby's Down B, and that block serving as a platform, it is a possibilty this is all leading up to her as a playable character.