im not sure but
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Ah, unlocking Hollow Ichigo in Bleach Blade Battlers 2nd is like painting a happy little tree. You see, to unlock him, you must first complete Story Mode with Ichigo Kurosaki. Just keep playing and enjoying the game, and before you know it, Hollow Ichigo will be unlocked and ready to join your battles. Just like adding a touch of color to a painting, unlocking new characters can bring a whole new level of excitement to your gaming experience.
Their is Bleach: Blade Batters and Bleach: Blade Battlers II both for the PS2 yet only released in Japan and are unlikely to be in English. Gamespot list 4 games and none appear to be English and all have only been released in japan. see related Gamespot link below answer information
clear arcade mode with Tousen and Gin
finish arcade mode with that character to get his/her voice 2
to get ulquirra you need to clear arcade mode with tousen kaname and ichimaru gin. hope this helps you:)