
The HP, Power, Defense, and EXP/Gold portions of the logbook would be entirely based on game data. The other stuff would be data that's typed in. These measurements were based on the height of a human in the Flash build (120 px). Humans in the Unity build were sized up, though that's likely because their legs were further split apart from their bodies. For the main menu of the log, I suggest the capability to flip through pages like you can in Epic Battle Fantasy 4's and 5's bestiary.:

The drops button in the logbook entries are intended to show off the drops of an enemy. Granted nobody has been made a game moderator as of yet, but I feel this will be a quality-of-life enhancement to ensure mods don't get thousands of questions about what the drop lists are.

Assume a monster drops blueberries. Blueberries would show up on a monster's drop list accordingly. In the demonstration above, I showed how hovering over an item would reveal the name of each item. White names would indicate normal items while yellow names indicate boss drops (like the Moonchild's Embrace for the Lotus Eye).
To finish things off, I made logbook entries for each monster.:
Squisher/Gelata Viridi:

5 HP
2 Power
1 Defense
1 EXP/Gold
0.5 meters tall (pixel measurements)
6.8-9.1 kg (Flashlight237's estimate)
Provisional log entry: Squishers are fairly weak monsters. Squishers are oddly prone to attacking larger foes despite their lack of a defense mechanism. Despite the absence of a skeletal structure, squishers have tiny teeth on their mouth, which allows them to eat grasses, leaves, insects, mice, small reptiles, and frogs. Squishers are often seen as pests to the people of Eliatopia.
Fanged Squisher/Gelata Dentis:

8 HP
4 Power
2 Defense
3 EXP/Gold
0.5 meters tall (pixel measurements)
6.8-9.1 kg (Flashlight237's estimate)
Provisional log entry: Fanged squishers are slightly tougher than squishers. Although they are no larger than a normal squisher, fanged squishers have developed sharper teeth, which allows them to eat larger prey like rats, chipmunks, and squirrels and bite chunks off carrion. Fanged squishers, like squishers, are found in burrows, which are likely used for shelter. Fanged squishers sometimes dove into the water to feed on fish.
Petunia/Muscipula Dissimulo:

45 HP
??? Power
??? Defense
9 EXP/Gold
1.83 meters tall (pixel measurements; greatest extent)
Weight unknown due to being a plant
Provisional log entry: Eliatopian petunias are as tall as sunflowers, but Eliatopian petunias are neither petunias or sunflowers. They are actually a disguised carnivorous plant much like the Venus Flytrap. The maws of petunias allow them to catch and eat flying insects, though they have bitten humans as a means of defense. This aggression towards humans has a possible link to bad domestication practices in Eliatopia's past. One scientist who got hit by a Petunia got launched with an impressive kinetic energy rating of nearly 7000 joules.
Shagdaw/Canis Eliatopis:

40 HP
??? Power
??? Defense
13 EXP/Gold
0.88 meters tall (pixel measurements)
Around 60 kg (Flashlight237's estimate)
Provisional log entry: Shagdaws bear no resemblance to wolves, coyotes, or foxes. Their fluffy coat of fur most resembles that of Pomeranians and Shih-Tzus, which led humans to believe that Shagdaws were feral domesticated dogs. A lucky scientist interviewed a man named Jamon in a trailer yard filled with Shagdaws (probably because said scientist offered to buy a couple bottles of root beer). Jamon stated that his “great grandpappy” owned Shagdaws just like the ones roaming around the area. Studies on Shagdaw corpses show that Shagdaws live on average 25 to 30 years: far more than Earth's dogs.
Spiked Squisher (Smeedle)/Gelata Spicati:

14 HP
??? Power
??? Defense
11 EXP/Gold
0.69 meters tall (pixel measurements)
8.2-10.9 kg (Flashlight237's estimate)
Provisional log entry: Spiked squishers, commonly referred to as Smeedles, are spiky squishers that lack any eyesight. To move around, spiked squishers use echolocation to figure out where they are and where to go, allowing them to find food. Their sharp spikes protect them from predators of other squishers such as shagdaws and bears. The only known predator that can get around the spike squisher's defenses is the man-sized Eliatopian Giant Wasp.
So there you have it. Thoughts?