No particular criteria except it has to be fluffy and sweet. Nothing will be excluded(ex: might have dense protags, harems, etc.) as long as it... more>> is sweet enough. That being said, if said bad elements(previous but also including things like low TL quality, rigid dialogue, etc.) detract too much to the point where it makes the story not feel fluffy/sweet enough then it won't be on this list. Exception to this rule is isekai cuz f*ck isekai. Anyways, prepare to die to sugar overdose.
<<less