Here it is, the most useful stat topic ever.
Goomba
1 HP
Susceptible to Physical, Magical damage, and Starman ID.
Attack: 50% PCHP damage, Small Hitbox
Koopa Troopa
1 HP
Cannot be killed by Physical damage, Paralyzed by Physical damage, recovers after 1 turn.
Susceptible to Magical damage, and Starman ID.
Attack: 50% PCHP damage, Small Hitbox
Paratroopa Koopa
2 HP
Flying, loses Flying attribute at 1 HP (attacked with Physical damage)
Cannot be kill by Physical damage, Paralyzed by Physical damage, recovers after 1 turn.
Susceptible to Magical damage, and Starman ID.
Attack: 50% PCHP damage, Small Hitbox
Piranha Plant
1 HP
Stationary
Immune to Physical damage.
Susceptible to Magical damage, and Starman ID.
Attack: 50% PCHP damage, Small Hitbox
Hide: Ducks into its Pipe, unable to be targeted, but cannot attack while hidden.
Bullet Bill
1 HP
Flying
Immune to Magical damage.
Susceptible to Physical damage, and Starman ID.
Attack: 50% PCHP damage, Small Hitbox
Buzzy Beetle
1 HP
Immune to Magical damage.
Cannot be killed by Physical damage, Paralyzed by Physical damage, recovers after 1 turn.
Susceptible to Starman ID.
Attack: 50% PCHP damage, Small Hitbox
Cheep-Cheep
1 HP
Flying, Aquatic
Aquatic version immune to Physical damage.
Susceptible to Physical (Flying only), Magical, and Starman ID.
Attack: 50% PCHP damage, Small Hitbox
Blooper
1 HP
Aquatic
Immune to Physical damage.
Susceptible to Magical damage, and Starman ID.
Attack: 50% PCHP damage, Small Hitbox
Spiny
1 HP
Immune to Physical Damage
Susceptible to Magical Damage, and Starman ID.
Attack 50% PCHP damage, Small Hitbox
Lakitu
1 HP
Flying
Susceptible to Physical, Magical, and Starman ID.
Attack: 50% PCHP damage, Small Hitbox
Spiny Throw: 50% PCHP damage, ranged attack. Summons a Spiny minion.
Hammer Bros
1 HP
Susceptible to Physical, Magical, and Starman ID.
Attack: 50% PCHP damage, Small Hitbox
Hammer Throw: 1-3 shots of 50% PCHP damage, ranged attack
Bowser
5 HP
Immune to Physical Damage, cannot face ID in-game.
Attack: 50% PCHP damage, Small Hitbox
Firebreath: 50% PCHP damage, ranged attack (avoids counters since he can attack from off-screen!)
Hammer Throw: 5 shots of 50% PCHP damage, ranged attack
Woohoo. Cast full of Physical/Magical spoilers, with Hammer Bros and Bowser able to do something like 150% PCHP damage.
for lulz:
Mario
2 HP
Jump-stomp: 1 dmg, physical. Paralyzes Shelled enemies (Koopa Troopas, Paratroopas, and Buzzy Beetles.)
Fireball: 1 dmg, magical, fire-elemental. 2 dmg to Winged enemies (Paratroopas)
Starman: Instant Death attack, gives Mario complete damage immunity for duration.
This topic is serious business.