DreamMix TV World Fighters is a Smash Bros style game featuring charaters from Hudson, Konami and Takara. These includes Solid Snake (Metal Gear), Simon Belmont (Castlevania), Twinbee (Twinbee), Takahashi Meijin (Adventure Island), Bomberman (Bomberman), Optimus Prime (Transformers), Microman (Micronauts) and more. The game was released in 2003 for both GameCube and PS2.
From the makers of Alundra, the game has a similar setting with a hero that enters dreams. Dual Heart was published in the US by Atlus and is a very overlooked game, that it was released just one week after Kingdom Hearts probably didnt help either.
Number 12 in Hudson's long running Momotarou Dentetsu series that originally started on the Famicom, they recently released Momotarou Dentetsu 16 for the Wii.
This game was released between Rakugaki Oukouku (Magic Pengel in the west) and Rakugaki Oukouku 2 (Graffiti Kingdom in the west). It has similar game mechanics to Magic Pengel.
An old trailer for Rise of the Robots trying to sell the game with hillarious phrases like "VR inspired background designed by an architect" or "fighting moves conceived by a martial arts expert" not to mention "Rise of the robots redefines the fighting genre and raises the ante on gamers with a futuristic motif proven in focus groups".
SCEI did two PS2 games that used voice recognition, the first game (Lifeline) was released in the west but Deka Voice was not. Interestingly the game is also compatible with Sony's Aibo.
Trailer for Taito's PS2 game Takahashi Naoko no Marathon Shiyouyo! This is a marathon running game featuring the Japanese olympic gold medal winner Naoko Takahashi.