Sergeant Major Purple

ムラサキ曹長, Murasaki, Ninja Murasaki
Even though he is smart Sergeant Purple a.k.a. Ninja Murasaki loses to Goku after a long drawn out somewhat farcical fight. He uses several ninja tricks to which Goku counters in his own kooky way. Even when he split into 5 Murasakis the Murasakis were just 5 identical brothers with Sergeant Purple as the oldest Goku was still able to defeat him. After the fight he tries to unleash Android 8 upon Goku or he would destroy Android 8. Android 8 refuses and Goku knocks out Purple before he could do anything. Murasaki eventually goes after Dr. Flappe and Android 8 but was presumably killed when Goku unintentionally tossed 8s bomb onto Murasakis cheek in the anime only.