Character Tiers: Subverted. There is pretty much no tier system agreed among fans. Though they wrote guides for a creature. Most guide writers often say that under powered creatures have no place in the metagame and are just be used only for collecting.
It's Easy, So It Sucks!: Many quests are easy to finish. The required the enemies to face in each quest are usually in ridiculously low levels, very little effort is required, and sometimes you ally with a character at level 100 when facing a stronger opponent in the quest.
Subverted in puzzles in quests, possibly due to edutainment reasons.
Nightmare Fuel: Before it got updated, the screen that appears every hour shows HELLO exercising, and advises players to exercise or take a break. At one point, two hands from portals out of nowhere appeared and initially made HELLO terrified and but jump ropes afterwards. Even though it is intended to be funny, it looks rather disturbing.
"Stop Having Fun" Guys: Similar to the competitive Pokémon community, there are people who take a Yabi's strength seriously in competition. To any upcoming Yabi whose power rank is revealed, expect reactions to it.
Tear Jerker: Baiyu ai yi's backstory, whom in the end matured after a losing its guardian.
Tier-Induced Scrappy: To competitive players, Yabis with a power rank of 6 (Which is considered low) are met with disapproval, even when they don't come out yet.