Crazy Packers Fan has ranked all of Mario 3's enemies based on their power... and yes, there is some personal biases involved.
 

Ranking	Enemy	Reason
1	Roy Koopa	He shakes the floor AND Mario’s usually weak coming into battle.
2	Ludwig von Koopa	He too shakes the floor, but Mario’s usually at full power coming into battle.
3	Wendy O. Koopa	Those candy rings don’t taste good.
4	Bowser Koopa	The fireballs hurt, but Bowser has a weakness to a weapon.
5	Lemmy Koopa	Those circus balls really pack a punch.
6	Boss Bass	He’s the only creature that can kill with one hit.
7	Roto Disc	It’s hard to kill, and easy to get hurt by.
8	Fire Chomp	It would surprise you how much these guys can hurt.
9	Buster Beetle	Although not fireproof, Buster Beetle is the best when it comes to tossing things at bad times.
10	Spiny Egg	Although easy to get rid of, if you have no firepower, these are the worst things to see falling from the sky.
11	Lakitu	This is the thrower of the Spiny Eggs which sometimes turn into Spinies, Lakitu is a pain by himself.
12	Iggy Koopa	This guy is fast, but not tricky enough.
13	Fire Brothers	These are the most unpredictable of all the Brothers.
14	Blooper Baby	The Babies are unbeatable, and unpredictable as well.
15	Blooper Nanny	This is the one who carries the unbeatable and unpredictable Babies, bringing problems as well.
16	Rocky Wrench	He’s good at tossing even more problems your way.
17	Sledge Brother	Big, tubby Brothers that shake the ground make matters worse for Mario.
18	Boom Boom	Remember him? Don’t even say you don’t. Boom-Boom appears in what seems like a million fortresses, and always puts up a good fight, unless you have a weapon.
19	Boo Diddly	How can Boo Diddly be described in a sentence? What a pain!
20	Micro-Goomba	These little, tiny Goombas restrict Mario’s jumping and make some more Mario mayhem.
21	Para-Goomba with Micro-Goombas	The worst of the two Para-Goombas, this Para-Goomba flies in Mario’s direction AND carries those stupid Micro-Goombas TOO.
22	Cheep Cheep	The worst ones of these are the flying ones, and the swimming ones aren’t bad either.
23	Hammer Brother	These troublesome Brothers still can make Mario’s life miserable.
24	Jelectro	Invincibility and water currents and scrolling screens all add up to a high ranking for the Jelectro.
25	Parabeetle	How are these hard to beat? If you kill one, you’ll lose a stepping stone, and that’s not good for completing the level. It’s a sort-of-protection in itself for the Parabeetles.
26	Spiny Cheep Cheep	Annoying and bad-looking, Spiny Cheep-Cheeps are no worse than normal Cheeps, but swim out of nowhere to hurt Mario.
27	The Angry Sun	World 8-2 is the best level for this angry guy, although he does also appear in the World 2 Desert. It’s nearly impossible to beat him there.
28	Ptooie	A sometimes-pipeless, sometimes-in-a-pipe Piranha, the Ptooie spits a spiked ball from its mouth and balances it there, shooting it up and down. He is hard to get by if you don’t have fireballs or a tail.
29	Thwomp	These ugly blue blocks can smash Mario easily if he’s not careful.
30	Fiery Walking Piranha	Technically not a “walking” Piranha, this guy is a Nipper that fires fireballs at you. Although not hard to avoid, he is kind-of-tough to beat.
31	Hot Foot	He’s like the Boo Diddly, only hotter.
32	Big Bertha	Not only does Big Bertha spit out babies, but she’s also really BIG, which can lead to problems in enclosed water areas.
33	Lava Lotus	At the end of 7-4, you’ll have a hard time getting past this Fiery water Piranha if you don’t swim by it right away.
34	Missile Bill	The “red”-hot Missile Bill can change directions at a moment’s notice, causing big problems at times.
35	Blooper	Blooper is fast at swimming AND homes in on you.
36	Venus Fire Trap	This fiery Piranha is easily avoided but always around to cause at least SOME trouble.
37	Spiny	Spinies make it hazardous to jump around when thrown by Lakitus.
38	Rocket Engines	These red-hot engines can really burn Mario up if Mario accidentally hits one, giving them this relatively high ranking.
39	Larry Koopa	Easy to beat, Larry offers little challenge in the first doomship.
40	Boomerang Brothers	These guys can “come back” to haunt you later if you simply jump over them.
41	Chain Chomp	Although chained up, this Chomp can still cause trouble if Mario jumps poorly.
42	Nipper	These Nipper plants can cause a lot of trouble if Mario’s trying to make a precise jump.
43	Munchers	These almost invincible Munchers can only be beaten in a crazy way- which makes them kind of elusive when it comes to trying to capture and defeat them. (You’ll only understand the capturing part if you know how to beat them.)
44	Morton Koopa Jr.	Slow and easy to beat, Morton isn’t very tough, so he gets this low ranking.
45	Buzzy Beetle	You can’t fireball this guy!
46	Colossal Koopa Paratroopa	These “big guys” can sometimes hit a block and change direction on you, which can hurt.
47	Spike	Spike is almost a difficult enemy- but not quite.
48	Stretch	It’s a “stretch” to say he’s a hard one to get by, but Stretch is one of those strange and sometimes difficult enemies.
49	Bullet Bill	Beware the Bullet Bill! Of course, if you’re in your right mind, you can just as easily stomp him.
50	Piranhacus Giganticus	This huge Piranha doesn’t stay in its pipe if you stand next to it, so it might take you by surprise.
51	Firesnake	This jumpy guy can hurt you if you’re in an enclosed area.
52	Dry Bones	Dry Bones keeps coming back- and that can hurt SOMETIMES.
53	Bob-omb	One Bob-omb in world 7-5 can almost automatically hit you if you get stuck underneath invisible blocks. Sometimes, they’ll hit you on the tanks, but not most of the time.
54	Baby Cheep	You’d be surprised how much this little fish can hurt you!
55	Red Koopa Paratroopa	Smarter Koopa Paratroopas wear red, which is why he won’t bounce or fly off a cliff.
56	Podoboo	Sometimes this lava ball will take you by surprise.
57	Pile-Driver Micro-Goomba	This brick lookalike can ALSO sometimes surprise you! (How many times have I said that?)
58	Red Giant Koopa Troopa	These smarter Koopa Troopas don’t walk or run off cliffs, and they’re bigger.
59	Red Koopa Troopa	These smarter Koopa Troopas don’t walk or run off cliffs, but they’re small.
60	Kuribo’s Goomba	Sometimes he’ll slip through a crack and hit you.
61	Para-Goomba (without Micro-Goombas)	Sometimes these almost-jumpers will hurt you.
62	Hanging Piranha Plant	Sometimes he will ALSO take you by surprise if you’re in a hurry and running.
63	Green Koopa Paratroopa	These guys jump up and down but also go off cliffs sometimes.
64	Green Gargantua Koopa Troopa	Huger Koopa Troopas are better, but not smarter.
65	Piranha Plant	The second World 7 Fortress has the hardest Piranha Plant in the game at the very beginning, except if you have hammers.
66	Grand Goomba	Easy to beat, but a bit bigger.
67	Green Koopa Troopa	These sometimes walk off cliffs stupidly, and they’re small.
68	Goomba	If you have trouble with him, turn off the game. Right now.

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