Suggested by Destroyer Ryuk may be a Shinigami but you can’t put him on the same level as the characters from Bleach. Ryuk’s physical abilities don’t seem all that impressive. He certainly isn’t a threat to a beast as fearsome as The BioLizard. A few lasers will be enough to take him down like pretty much every other opponent that tried to get in the BioLizard’s way. The BioLizard wins.