Fight through the usual arcade ladder. You will face the core roster in random order. You do not need perfect rounds (2-0 wins are not required). You just need to survive.
: Using two Urikos at once (Player vs. CPU or Player vs. Player) typically causes the game to Bloody Roar 1 Unlock Uriko
While Uriko isn't available, you can unlock several other features in by completing the game: Unlockable Bonus Options Menu Beat the game on Level 4 or higher. Afterimage Mode Beat the game with every character. Kids Mode Finish Arcade Mode on Level 4+ without using a continue. Custom Appearance Beat the game without continues on Level 4 or higher. Later Games Comparison Bloody Roar 1: The Complete Guide to Unlocking
Hold L1 and L2 while selecting your character (after beating 10 opponents in Survival Mode). No Wall Mode: Clear Time Attack Mode in under 10 minutes. You do not need perfect rounds (2-0 wins are not required)