As a mermaid is fictional it would not be possible to have a winner except in a fictional story. The winner would be determined by the author of the story.
Ninja.
Ninja
It actually is the ninja who would win if u watched Deadliest Warrior, they proved that a ninja would win, so nice fail bruh.
a ninja cat
ninja
a ninja because they cannot be seen he would slice him in half
The ninja turtles would win
I think the ninja would win. The ninja would 1st break of the unicorns horn and break its legs so it could not hurt the ninja. The ninja would then think of a slow and painful way to kill the unicorn. THE END
A sniper would win cause he could see the ninja way before the ninja even knew were he was.
Marine!
It would depend on where the fight was based, but in the water, the mermaid would have a definite advantage. The ninja would not be able to move effectively or properly use his weapons. The mermaid would just need to get him down under the water and wait for oxygen to run out.
NINJAS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
yes