Compared to his previous form, Slugger has a more humanoid, bulky appearance. He has four arms, the two outer arms wearing black tight gloves and holding gray-colored baseball bats, and the inner left one wearing a pitcher glove. He also wears a helmet with a flame design and sporting a black visor.
Slugger, upon evolving, gains a newfound confidence which in turn allows him to play baseball better.
Goofball makes his debut in EP166, where he evolves into Slugger thanks to Tomorrow Gal's cheerleader powers, and gains a better talent to play baseball. During a match in the Yo-kai World, he manages to give Chicken Chukket a strike, which causes Tomorrow Gal to turn to cheer him instead. Out of shock, he reverts back into Goofball.
Etymology
"Damajor Nine" is a wordplay on dame ja nai (だめじゃない, "not so bad", "it's not hopeless"), and the English words major & nine.
"Slugger" translates into a person who strikes hard with heavy blows, the word is often used for sportplayers such as Baseball.
"Bestball" is a pun on beste (best) and Baseball.
"Bateadós" is translated as "Battered," also Bateado is a slang for someone who was rejected in love.
"Straik" is a corruption of strike.
Trivia
Slugger's "random" nicknames are: Lando, Newton, All Star, and Gordon.
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