OK K.O.! Let's Be Heroes - Season 1, Episode 22: Plaza Prom
A quick glimpse of Judy's blog.
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OK K.O.! Let's Be Heroes - Season 1, Episode 21: You Have to Care
Elodie visits Lakewood Plaza to connect with the little people.
NEW GAME!! - Episode 6: Wow... It's So Amazing..
http://www.crunchyroll.com/new-game/episode-6-wow-its-so-amazing-742161 Hajime does some boxing for motion capture for a video game character.
Gintama - Season 1, Episode 106: Love Is Often Played Out In Sudden Death
http://www.crunchyroll.com/gintama/episode-106-love-is-often-played-out-in-sudden-death-510274 Otae comes to a soccer match thinking it's muay thai.
Gintama - Season 1, Episode 27: Some Things Can’t Be Cut with a Sword
http://www.crunchyroll.com/gintama/episode-27-some-things-cant-be-cut-with-a-sword-510090 Pop star Otsuu has a short stint as a fighter. Quick scene.
Senki Zesshou Symphogear - Season 1, Episode 5: From the Bottom of a Dark Abyss
Hibiki does some boxing training.
OK K.O.! Let's Be Heroes - Season 1, Episode 11: You Get Me
An appearance by Punching Judy and Carol on the bag.
Cannonball Fist
http://cannonballfist.com/?page_id=171 "Cannonball Fist is a comic about Clara “Cannonball” Jayne, a young boxer who comes to Southpaw City seeking to become the world’s greatest fighter. She fights monsters and it’s a good time." Hasn't been updated since 2015.
Doug - Season 4, Episode 7b: Doug Clobbers Patti
Doug accidentally knocks out Patti in a fantasy sequence.