6 Eggknock is the only Rare monster that can possess enemies.
(Probably the best rare for me)
7 The Monster Darude's name and appearance is a complete reference of the song "Sandstorm" by Darude.
(He is a sand, not a coincidence.)
8 El Dino Volador's Name is Alfredosaurus
(Sounds meaningful enough)
9 Mega Freeze and Mega Stun affects monsters immune to Freeze and Stun.
(I have a suggestion here, if immunity to stun negates stun, it should make mega stun 1 turn, same goes with freeze and also change the name to Stun/Freeze Resistance)
10 Semargl and Postiguraf attacks in skill group 1-3 and Special attack have the exact same damage and stamina cost
(Bonus Fact! Semargl's overall stat is higher by 20 than Postiguraf's overall stat. Well that would make sense since Postiguraf is the evil version)