So I'm going to do this since we're talking about it...
Here's every enemy in the original RE2:
Now to break this down in comparison to the remake:
-Zombies are in and have more variety, detail, and mechanical depth than ever before.
-Lickers are in and have more detail and mechanical depth than ever before.
-Zombie dogs are in and have more detail and mechanical depth than ever before.
-Crows are in the game, but they're no longer enemies. In the original they broke through the windows of a single hall and flew around in circles.
-Marvin is in the game as a zombie. There's actually MORE special zombies like Marvin in the game I'll also mention, dynamic zombies for certain scenarios and characters.
-G-Type Adult is in the game and now is a regular enemy type, has a LOT more depth than the original.
-G-Type Young is in the game, it's attached to G-Type Adult like the original but reimagined.
-Large Roaches are in a game, but more of an environmental thing and occasional hazard than an enemy type (which they only appeared in a single room for Sherry as a hazard in the original, so pretty accurate).
-Giant Spiders are cut, though actual spiders do sometimes appear but not as an enemy.
-Giant Alligator is in the game.
-Evolved Lickers were cut, but there's a lot more depth and mechanical variety to the regular Lickers.
-Vines are in the game, but like the original they're more a hazard.
-Ivy is in the game and has more detail and mechanical depth than ever before. Poison Ivy and Ivy are combined a bit now, but there's more individual variety.
-Larvae and Giant Moth were cut, well for one Larvae weren't enemies in the original but this list includes everything. There was literally only one moth in the original and all it did was fly around and poison you.
-G1 is in the game and has more variety, detail, and mechanical depth than ever before.
-G2 is in the game and has more variety, detail, and mechanical depth than ever before.
-G3 is in the game and has more variety, detail, and mechanical depth than ever before.
-G4 is in the game and has more variety, detail, and mechanical depth than ever before.
-G5 is in the game and has more variety, detail, and mechanical depth than ever before.
-Mr. X is in the game has has more role and mechanical depth within the game than ever before.
-Mr. X's Mutation is in the game and has more to it as well (he's been GREATLY reimagined in design and function).
-Brad Vickers makes a cameo, but his zombie isn't in this game (maybe due to something planned for REmake 3), however the zombies have more special variety types than the original did.
Just to break this down.