These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
The Shiori Arc, which lasted for three episodes, still had rather stretched out scenes, all of them from Shiori's perspective. The whole thing could've been reduced to two episodes.
The awakening of the final Goddess, Mercury, drags on throughout the entire second half of the Goddess arc due to the Love Triangle mess between Keima, Ayumi and Chihiro. By the time Keima was on the final route after realizing Mercury was in Ayumi, people just wanted the arc over and done with.
Shiori is apparently very popular among the Japanese. In fact, her first capture arc really pushed this series' popularity to be on the map. Considering her long absence, she ranked number 3 in the most recent official poll. She was just right behind the neck to neck contenders for number one spot Tenri and Haqua, both appear in many more chapters compared to Shiori (at least until it became rigged by 2channers after the first few days).
Kanon is one, although not as much as Shiori.
Judging by the later chapters, Chihiro is on her way to becoming one. After all she has recently been confirmed to have liked Keima before her original conquest had even occurred.
Urara quickly became one due to her...naughtyness as a minor. Then later on, a Weiss enters her and she suddenly ages into a fine looking woman.
Harsher in Hindsight: During Chihiro's capture arc, Keima said that there is a weird factor about her - "there is a boy she likes" - Elsie also speculated that "crevice in her heart got bigger because of her love". Everyone forgot about it after the capture, and then in chapter 166 we got to know that the boy she liked is Keima, and it was her inability to cope with this (with the fact that she likes probably the least popular boy in the whole school) that made it possible for a Weiss to possess her.
Ho Yay: Sort of, in Chapter 124. Yui, in her masculine clothing apparently trying to seduce Keima. Made worse by Keima's rather feminine response probably due to spending time in Yui's body.
Iron Woobie: Though he says he doesn't like real "girls", it becomes apparent that what he hates is in fact everything real - he finds himself at such odds with the real world that he actively rejects it and takes refuge in games. What he's doing is going outside an incredibly small and restrictive comfort zone in order to do someting he would run away to avoid if he had the choice, but he's shouldering the burden and putting his everything into this thing he hates doing. And, though he might moan, he never runs away, never breaks down - he always keeps his cool and goes through with it.
Moe: The girls that Keima has to court are plays on Moe stereotypes in varying degrees. Being a Genre Savvy Otaku, he goes into a rant when he encounters one that doesn't seem to fit with the archetype.
Nightmare Fuel Station Attendant: Elsie simply doesn't comprehend why humans might be disturbed by her cooking, or the souvenirs she brings back from hell, or the idea of eating something alive because it's fresher.
Keima×Tenri, Keima×Elsie, and Keima×Haqua. The rest of the sub-heroines don't stand a chance...
Diana as a bonus for Tenri-fans, or vice-versa.
Although Diana's sisters may shake things up.
Keima×Yui is gaining ground fast. Yui is pretty much the only girl that has actually made Keima flustered, and Keima admitted that even though he was trying to just put on an act, he wound up letting her take the lead a lot and she made him feel "fuzzy headed". Haqua even notices and comments on it, teasing Keima that maybe his "real" girl type is one with a forceful personality. Not to mention the fact that she's the first human girl he's seen naked because they swapped bodies for a time. Actually, the reverse holds true as well.
There's also a lot of support for a Keima×Kanon pairing, especially in the recent Goddess Arc. Plus, Kanon is the first girl to confess to him.
Keima×Chihiro got more fans supporting it thanks to last chapters in the "Searching for the Goddesses" arc, as well as the revelation that Chihiro had probably genuinely loved Keima before her capture arc, through no manipulations on his part.
Pick the woman amongst Keima's capture targets (or someone else) that has the best chance to end up with him and let the debating begin.
Tenri and Chihiro are the top candidates at the moment due to being the only girls that actually liked Keima before he got involved in their conquests. Elsie, Ayumi, Kanon, Haqua and Diana are also worthy choices amongst the fanbase.
And if one doesn't side with any of the ladies...there's always Yokkyun.
Viewer Gender Confusion: Dokuro Skull, revealed to be female (like all other New Devils) in Chapter 151. The anime missed the memo; her Japanese voice actress uses such a gruff voice she sounds male, and her dub VA is male.
