Every game has an enemy that's so weak, it makes you wonder why it's even there. Name one of these kinds of evil losers. No repeating, though. Mine is Sepiroth's Final form in FF7.

Bowser from super Mario sunshine.
Bowser actually was so easy to beat it was scary.

My example of an enemy that is really weak and really serves no purpose or challenge in a video game is actually multiple enemies - the team of mini characters in Super Smash Bros. Melee. You know, the ones that you face about halfway through classic mode? The ones that you can kill in one hit? Yeah. Them.

Almost every enemy in Twilight Princess before the Temple of Time.

In fact, here's the FEW enemies that will actually do something:

torch slugs.

red deku babas

bombfish

Wow. . . that's it. . . and these enemies deal only 1/4 heart of damage. . . 

Oh yeah, enemies actually pick up at Snow Peak Ruins, I forgot about those guys. (try Zora Mail! that'll REALLY make it hard!

Oh, I guess that you might throw chus in here.

Actually, I noticed how pointless it was to have some enemies in certain games, in fact, I think that Mega Man is the first game that I played where all enemies are actually potentially lethal.

All the leveled bosses in Skyrim. If you are under level 20, and you have heavy armor, with that and your preferred weapon style tree upgraded a bit, it is just ridiculous . 

Ganon in Twillight Princess. Seriously, that guy hit so soft it was sad. One of the easiest final bosses i've ever fought.

The sweeping witch from Kirby. That's all I have to say.

I'd say either the Bowser battles in Mario 64, or even Golem from OoT's first dungeon(or whatever he's called) Just a complete joke from what you'd expect.

I would say any enemy or boss that you have to shoot its eye to hurt it. So original! So insane, so obvious, so boring.

Boss Dumb Drum from Donkey Kong Country. They must have had run out of ideas for bosses over at Rare that day.

Those little animals in Rift that don't even fight back, heh I thought of them right away when I saw the question, I don't even think can they fight back? They are technically an enemy though.

Goombas - These things are so pathetic that I wonder why they are even in the Mario game. I mean, COME ON!!!! All you do is jump on them to defeat them. Why can't you make them harder than that to destroy? Give them some fire power, ice power, anything to make them harder to defeat. These enemies are just so pathetic.

Koopas - same goes for these enemies. Give them anything to make them harder to defeat.

~PokePal435 has left the building~

tgags123 : I know I'm 4 months late, but try fighting the teams on Hard or Very Hard. They weigh as much as a regular fighter, so it's literally like fighting a team of 20 level 9 computers.

Personally, I think Goombas are the most pointless enemies. The only times I have ever gotten hurt badly by one is in Super Mario World, where they are vastly different from other games. What exactly is the point of them? No one minds them.

Waddle Dees from Kirby.
Any enemy from Call of Duty's campaign mode.
Goombas and Koopas from Mario.
Joe Cobb from Fallout: New Vegas.
Can I just say: The campaign from Grand Theft Auto V? So easy compared to IV. And I think I got killed more by gravity than by actual enemies in V, to boot.
Bidoof, Starly, Pidove, etc. The first form "Route 1" type.
Olimar or Ice Climbers from the Smash games.
(Most of the time) Spies from Team Fortress 2. Obvious Spy is obvious.
Zombies from wave one in any of Treyarch's games.
Any enemy from the mobile game, Kill Shot.
Any enemy at your level from the mobile game, Battle Nations.
Regular enemies at "Normal" difficulty on Marvel Heroes 2015.
The Broforce "Mooks", (specifically the "Spotters" and the "Pure Evils" which stand around and do nothing).
The enemies from Goat Simulator's "Goat MMO" level. Seriously. You can't die in this game so...
Pirates from Realm of the Mad God.
Enemies from the Alpha Sector in Strabound.
Pre Hardmode surface enemies in Terraria.
Un-armored security and officers, Payday and Payday 2.
LEGO games, no enemies specifically.
Psychos and Marauders from the Borderlands series.
Riflemen in Boom Beach and Barbarians in Clash of Clans.
Thugs from "The Amazing Spider-Man 2".
Grunts and Skirmishers from Halo series.
Trainers; Pokémon Battle Revolution.
Storm Troopers from the Force Unleashed series.
Piranha plants when you have the Fire Flower ability, but specifically the first boss plant in Super Mario Galaxy.
Regular zombies, pretty much any game including Left for Dead and Red Dead Redemption: Undead Nightmare.
Most characters that aren't from an FPS or fighting game in PlayStation All Stars: Battle Royale.
Regular guards: Splinter Cell: Blacklist.
Regular Panau soldiers, Just Cause 2.

MysteriousPanzer : DANGIT MAN YOU TOOK EVERYTHING!

Umm... well... crap. Ok, something I would obviously point out... BAKIS! Yes, there's a goomba-like enemy in Drawn to Life called a baki. Are you not entertained. X3 Sure there's variants depending on what world you are in, but in the first world a single one is no threat. Also in Next Chapter they're all a bit more similar.

The first Bowser on Super Mario 64 is just way too easy. 

Mecha Leo : Not EVERYTHING.
There's still regular enemies from Sleeping Dogs.
The arena bosses from Spore 2 (except your corrupted Sensei guy).
Half Life zombies.
Minions from League of Legends.
Magikarp.
Negative Man, Earthbound.
Metapod.
I'll stop now.

righteousnoob : If you are talking about the final duel between Sephiroth and Cloud, it was a scripted battle. However, if you're talking about Safer-Sephiroth then I am sure there are plenty of people who absolutely disagree with you.

Rattata from Pokemon: Fire Red. Seriously, those things get killed easily, unless you train them rightly.