Castlevania/Enemies

Ghouls
HP: 1

They walk across the screen and then leave. They often appear in groups of two or three and from both sides of the screen. Wait until the Ghouls get close and hit them all at the same time to get rid of them quickly.

Bats
HP: 1

They will appear at the height and the direction you're facing and then fly off of the screen. They are fairly slow and simple to kill. You shouldn't have too much trouble with these enemies through the game.

Fish Men
HP: 1

They jump out of the water, and if they touch down on ground, they will walk around and shoot out fireballs once in awhile. They are simple to kill but watch out when they jump out of the water, especially when you're on the moving platforms on stage 4. The best way to avoid getting knocked into the water on that stage is to move to the edge of moving platform or kill it if you can.

Spear Knights
HP: 2

They walk around the screen randomly but they have no real attack. It takes two hits to defeat one so give yourself some room before attacking. Since it might turn back towards you at any time, avoid approaching one from close range while it's walking away after you drop down or jump from a platform.

Medusa Heads
HP: 1

They appear from the direction you're facing and then leave the screen. When you encounter them try not to turn in the other direction or they will start coming from that direction instead. Jump over or walk under them to avoid them. Or just hitting them works as well.

Spirits
HP: 2

They appear in set places in a few stages. They don't move very quick but it takes two hits to defeat one. Whip them quickly and move on or they will just follow you around until they run into you.

Bone Towers
HP: 6

These stationary objects can take quite a beating and their fireballs are a slight hazard. The fireballs are spaced far enough apart that you can jump over each one quite easily but whipping them is just as effective.

Hunchbacks
HP: 1

Hunchbacks don't appear randomly, except when a Bird is carrying one, but they have a random attack pattern which is usually a short hop, short hop, and then a jump. Hit them as soon as possible but don't let them get close or gather in groups. You don't need to duck to hit one, which is something I usually did out of habit for a long time before I stopped.

Skele-Dragons
HP: 6

They rarely appear but they are one of the toughest enemies in the game. They attack by shooting fireballs out of their mouth, and moving their bodies around to avoid your attacks. Since it's anchored to the wall, you should stand as far away as you can and attack it from a distance.

Axe Knights
HP: 8

The upgrade of the Spear Knight and one of the toughest enemies in the game. They attack with throwing axes that they will toss either high or low. The axes will also come back after flying a distance away. The best way to destroy them is to use Holy Water or Axes. Whip the Axes that they throw as well so that they don't become a bother when they come back towards the Axe Knight.

Birds
HP: 1

They will only appear carrying Hunchbacks back and forth across the screen. The Hunchback fall to the ground randomly and bother you until you kill it. If you kill the Bird while it's carrying the Hunchback, both of them will be killed at the same time.

Ravens
HP: 1

They are pretty quick but are easily killed since they follow an obvious path which for the most part is flying a little bit when you activate one and then flying straight across. They usually leave the screen when they fly straight across but other times they will fly down toward you or back up to try and attack you again. Whip them quickly when they activate to be done with them.

Skeleton
HP: 1

They are the main enemy you encounter after the Ghouls in the first stage. They walk around slowly and wait to turned into a pile of bones. Simple enough.

Throwing Skeleton
HP: 1

The upgrade of the regular Skeleton. They are quicker and have an actual attack but they are still pretty simple to kill.

Red Skeleton
HP: 1 (infinite)

They are the same as the regular Skeleton but they can't be killed. When you hit one, it will collapse into a pile of bones but they will get up again after awhile. Just whip it and then move on before it gets up again.