Personalities
Monsters
Memes
100

The personality with the ability "Again".

Stubborn

100

The monster with the most variants.

Snurp (9 variants)

100

The best enemy in the game.

Twerkey

200

The name of the "Cool" personality's skill that allows them to do more damage.

Pressure Point.

200

The enemy most people consider to be responsible for the highest difficulty spike in the game.

Clever Running Nose.

200

The person responsible for the "Cat suit inbound" meme.

Failboat

300

The number of personalities without any objectively bad abilities. 

3 (Cautious, Energetic, Airheaded)

300

The first monster type that you fight both a boss variant and a regular variant of.

Butterfly/Moth (Rock Moth + Butterfly "Carefree Guide")

300

The pair of assignable roles mainly used for shipping.

The Lovey-Dovey Couple

400

The personalities that get angry when "Avenge" triggers.

Cool, Stubborn, Energetic

400

The number of different enemies you can encounter before Neksdor (not including rare/gold/tasty snurps).

23

400

The greatest part of Miitopia.

The Soundtrack.

500

The names of all the "Airheaded" abilities.

Oops!, Frolic, Sleepyhead

500
Monster number 60 in the journal. 

Banana Mii Trap.

500

Everyone's least favourite armour set.

Macho.