So some of these are already known spirits, maybe all of them will be, but honestly I don't really care!
BEAN SELLER
SUPPORT NOVICE
Ability: Fighter gains significantly more health from food items.
Match: Defeat Villager on Great Bay. Villager loves planting... watch out for the three small Piranha Plants defending him!
POKEMON RANGERS
PRIMARY (GRAB) NOVICE
Match: Defeat Richter Belmont on Saffron City. Richter uses his whip exclusively, and is protected by Pikachu, Pichu, and Jigglypuff.
HENRY
PRIMARY (ATTACK) NOVICE
Match: Defeat Robin on Dracula's Castle. Robin only uses tomes and taunts frequently, and is guarded by two small black Ridleys.
STARMAN JR.
SUPPORT ADVANCED
Ability: The fighter starts with the Franklin Badge equipped.
Match: Defeat Ness on Rainbow Road (Omega form). Ness stays in one place and uses his PSI attacks.
FROGGER
SUPPORT ADVANCED
Ability: The fighter has increased jump height.
Match: Defeat green Greninja on Onett. The cars on Onett are almost non-stop and three small King K. Rools attack both the player and Greninja.
ADELEINE
SUPPORT ADVANCED
Ability: The fighter's Special moves are powered up.
Match: Defeat Inkling on Green Greens. Inkling is defended by multicolored Mr. Game & Watch's.
SAMURAI GOROH
PRIMARY (ATTACK) ADVANCED
Match: Defeat Wario on Big Blue. Wario is equipped with the Killing Edge and loves riding his bike.
Ability: The fighter has autohealing.
Match: Defeat Corrin on Coliseum. Corrin is guarded by Jigglypuff who sings endlessly.
Match: Defeat Roy on Midgar. Roy is backed up by a blue Zelda who spams Din's Fire.
Ability: The fighter starts the battle with a Hammer equipped.
Match: Defeat giant R.O.B. on Gaur Plains. Hammers spawn frequently.
Ability: The fighter starts with a Cucco.
Match: Defeat Link on Hyrule Castle. Cucco's rain from the sky.