This goes for each prefer character matchups in their series, wins, loses, and draws. So anyways let's get started.
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Characters preferred opponents W-L-D Mario VS Sonic (Sega) L Luigi VS Tails (Sonic) W Donkey Kong VS Knuckles (Sonic) W Wario VS King Dedede (Kirby) L Peach VS Zelda (Zelda) W Bowser VS Dr. Eggman (Sonic) W Yoshi VS Chocobo (Final Fantasy) W Bowser. Jr VS Tron Bonne (Mega Man) W King K. Rool VS Gruntilda (Banjo-Kazooie) W Daisy VS Blaze (Sonic) L Rosalina VS Palutena (Kid Icuras) W
Total: 8 wins and 3 loses
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Characters preferred opponents W-L-D Sonic VS Mario (Nintendo) W Tails VS Luigi (Mario) L Shadow VS Mewtwo (Pokémon) W Dr. Eggman VS Bowser (Mario) L Silver VS Trunks (Dragon Ball) W Knuckles VS Donkey Kong (Mario) L Blaze VS Daisy (Mario) W Dr. Eggman VS Bowser (Mario) L Amy VS Sakura (Naruto) W Metal Sonic VS Bass (Mega Man) W Dr. Eggman Nega VS Lord Wily (Mega Man) W
Total: 7 wins and 4 loses
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Characters preferred opponents W-L-D Mega Man VS Astro Boy (Astro Boy) W Proto Man VS Copen (Azure Striker Gunvolt) W Bass VS Metal Sonic (Sonic) L Dr. Wily VS Dr. Eggman (Sonic) L Mega Man X VS Optimus Primal (Transfromers) L Zero VS Shadow (Sonic) L Axl VS Roxas (Kingdom Hearts) L Sigma VS Ultron (Marvel) L Omega VS Galacta Knight (Kirby) L Mega Man Volnutt VS Quote (Cave Story) W Tron Bonne VS Bowser. Jr (Mario) L MegaMan.EXE VS Nahobino (Shin Megami Tensei) L Lord Wily VS Dr. Eggman Nega (Sonic) L Star Force Mega Man VS Blue Beetle (DC) L Vent VS Troy Burrows (Power Rangers) W
Total: 4 wins, 11 loses
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Characters preferred opponents W-L-D Sora VS Link (Zelda) W Riku VS Meta Knight (Kirby) L Kairi VS Asuna (Sword Art Online) W Roxas VS Axl (Mega Man) W Xion VS Nier (Nier Replicant) W Axel VS Renji (Bleach) W Aqua VS Jeanne d'Arc (Fate) W Terra VS Richter (Castlevania) W Ventus VS Pyrrha (Soul) W King Mickey VS Yoda (Star Wars) W Xehanort VS Palpatine (Star Wars) W Vanitas VS Baby (Dragon Ball) W Xemnas VS Pain (Naruto) W
Total: 12 wins, 1 lose
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Characters preferred opponents W-L-D Kirby VS Majin Buu (Dragon Ball) W King Dedede VS Wario (Mario) W Meta Knight VS Riku (Kingdom Hearts) W Gooey VS Yoshi (Mario) W Bandana Dee VS Hero Prinny (Disgaea) W Galacta Knight VS Omega (Mega Man) W