Paper Mario/Enemies

Goomba Backyard

 * Jr. Troopa (5 Hp)
 * Goomba (2 Hp)
 * Spiked Goomba (2 Hp)
 * Paragoomba (2 Hp)

Goomba Road

 * Goomba (2 Hp)
 * Spiked Goomba (2 Hp)
 * Paragoomba (2 Hp)
 * Red Goomba (7 Hp)
 * Blue Goomba (6 Hp)

King Goomba's Castle

 * King Goomba (10 Hp)
 * Red Goomba (2 Hp)
 * Blue Goomba (2 Hp)

Pleasant Path

 * Kent C. Koopa (70 Hp) (only appears after Chapter 5)
 * Koopa Troopa (4 Hp)
 * Parakoopa (4 Hp)
 * Goomba (2 Hp)
 * Spiked Goomba (2 Hp)
 * Paragoomba (2 Hp)
 * Jr. Troopa (8 Hp)

Koopa Bros. Fortress

 * Koopa Troopa (4 Hp)
 * Paratroopa (4 Hp)
 * Bob-omb (4 Hp)
 * Bullet Bill (2 Hp)
 * Bill Blaster (8 Hp)
 * Bowser??? (Ninjakoopa Disguise: 10HP)
 * Red Ninjakoopa (5 Hp)
 * Black Ninjakoopa (5 Hp)
 * Yellow Ninjakoopa (5 Hp)
 * Green Ninjakoopa (5 Hp)

Mt. Rugged

 * Cleft (2 Hp)
 * Monty Mole (3 Hp)
 * Buzzar (20 Hp) mini-boss (you can avoid him by answering that you are Luigi)

Dry Dry Desert

 * Bandit (4 Hp)
 * Pokey (7 Hp)

Dry Dry Ruins

 * Pokey Mummy (7 Hp)
 * Buzzy Beetle (5 Hp)
 * Swooper (3 Hp)
 * Stone Chomp (4 Hp)
 * Chompy and Chomps (3 Hp)
 * Tutankoopa (30 Hp)

Forever Forest

 * Forest Fuzzy (6 Hp)
 * Pirahna Plant (5 Hp)
 * Jr. Troopa (40 Hp)(appears after beating the chapter)

Gusty Gulch

 * Hyper Goomba (8 Hp)
 * Hyper Spiked Goomba (8 Hp)
 * Hyper Paragoomba (8 Hp)
 * Hyper Cleft (4 Hp)
 * Tubba Blubba (10 Hp)

Tubba Blubba's Castle

 * Clubba (6 Hp)

Inside the Windmill

 * Hyper Goomba (8 Hp)
 * Tubba's Heart (50 Hp)

Shy Guys Toy Box

 * Shy Guy (7 Hp)
 * Anti-Guy (50 Hp)
 * Paraguy (7 Hp)
 * Groove Guy (7 Hp)
 * Pyro Guy (7 Hp)
 * Medi Guy (7 Hp)
 * Spy Guy (7 Hp)
 * Lantern Ghost (20 Hp) mini-boss
 * Shy Guy army (5 Hp)
 * Stilt Guy (7 Hp)
 * Shy Stack (10 Hp)
 * General Guy (30 Hp)

Lavalava Island

 * Jungle Fuzzy (5 Hp)

Jade Jungle

 * Jungle Fuzzy (5 Hp)
 * Spear Guy (7 Hp)
 * Hurt Plant (5 Hp)
 * M. Bush (5 Hp)
 * Putrid Piranha(12 Hp)
 * White Magikoopa (11 Hp)

Mt. Lavalava

 * Putrid Piranha(12 Hp)
 * Red Magikoopa (11 Hp)
 * White Magikoopa (11 Hp)
 * Spike Top (5 Hp)
 * Lava Bubble (8 Hp)
 * Lava Pirahna First Time (40 Hp) Second Time (40 Hp)
 * Lava Bud (8 Hp)

Toad Town Harbor

 * Fuzzipede (20 Hp)
 * Jr. Troopa (20 Hp)

Bestiary
Enemy names in Bold Print are bosses.