Killer Jr. Ball

Killer Jr. Ball is the name of Bowser Jr.'s Star Skill in Mario Superstar Baseball. He uses it while either pitching or batting, upon which the baseball turns into a Bullet Bill wearing his bib. Aside from this aesthetic difference, Killer Jr. Ball is essentially the same as Bowser's Star Skill, Killer Ball. In Challenge mode, the Jr. Mask must be bought before Bowser Jr. can start using the move.

If Bowser Jr. uses Killer Jr. Ball while pitching, the Bullet Bill slowly approaches the home plate, does a loop and then, and then dashes. If the move is used while batting, the Bullet Bill charges across the field. If it is caught by a fielder, they are pushed a distance back.

Killer Jr. Ball is one of the Star Skills to not return in Mario Super Sluggers. Here, Bowser Jr. instead uses the Graffiti Ball for pitching and the Graffiti Swing for batting.

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Playable characters	Team captains	Mario • Luigi • Princess Peach • Princess Daisy • Yoshi • Birdo • Wario • Waluigi • Donkey Kong • Diddy Kong • Bowser • Bowser Jr.
Playable characters	Team players	Baby Mario • Baby Luigi • Dixie Kong • Toad • Toadette • Toadsworth • Pianta • Noki • Koopa Troopa • Koopa Paratroopa • Magikoopa • Hammer Bro • Dry Bones • Boo • King Boo • Petey Piranha • Goomba • Paragoomba • Monty Mole • Shy Guy
Star Skills	Star Skills	Fireball (Mario) • Green Fireball (Luigi) • Heart Ball (Peach) • Flower Ball (Daisy) • Egg Ball (Yoshi) • Weird Ball (Birdo) • Phony Ball (Wario) • Liar Ball (Waluigi) • Banana Ball (Donkey Kong) • Boomerang Ball (Diddy Kong) • Killer Ball (Bowser) • Killer Jr. Ball (Bowser Jr.)
Special moves	Special moves	Ball Dash • Body Check • Clamber • Laser Beam • Magical Catch • Quick Throw • Sliding Catch • Suction • Super Catch • Super Jump • Tongue Catch • Wall Jump
Challenge mode items		Red Fireball (Mario) • Green Fireball (Luigi) • Lovely Heart (Peach) • Pretty Flowers (Daisy) • Egg (Yoshi) • Pink Egg (Birdo) • Gnarly Garlic (Wario) • Whiskered Eggplant (Waluigi) • King Banana (Donkey Kong) • Chimp Banana (Diddy Kong) • Bullet Bill (Bowser) • Jr. Mask (Bowser Jr.)
Default teams		Mario Sunshines • Peach Monarchs • Wario Greats • Yoshi Islanders • DK Kongs • Bowser Monsters
Stadiums		Mario Stadium • Peach Garden • Wario Palace • Yoshi Park • Donkey Kong Jungle • Bowser Castle • Toy Field
Minigames		Bob-omb Derby • Wall Ball • Chain Chomp Sprint • Piranha Panic • Barrel Batter • Star Dash
Species		Chain Chomp • Klaptrap • Piranha Plant • Podoboo • Thwomp
Objects		Barrel • Barrel Cannon • Brick Block • Cyclone Generator • Empty Block • Millstone • Jump Block
Miscellaneous		Superstar Challenge