Rei loves exciting battles, especially when he has a strong opponent. He calls himself &quot;The Number One Star&quot; and is obsessed with being the number one. He gets burned up easily and is very interested in getting the ultimate treasure, The Ultimate Battle Spirits. <br /> When he battles, he changes personality, depending on his form. His red form, Zero the Burning, is hotblooded while his white form, Zero the Silver, is more cool and serious.<br /> <br /> Rei is an ultimate-user and Card Quester, who is seeking The Ultimate Battle Spirits. He travels through space in his ship, The Number One Star Ship. His partner is a dragon named Mugen, who turns into the card Mugendra. He is also friends with a robot named Salt, who cooks pizza.<br /><br />