What series needs another season for closure?
Spice and Wolf?
One Outs, I'm pretty sure they could fit the rest of the Manga into a second ~24 episode season.
Lucky Star ended pretty well. I would be happy with a second season but it doesn't really "need" one.
Fuck you, Tim and Eric.
Madoka because Rebellion
Haruhi, more like 2-3 more seasons if not a couple more movies.
Sound of The Sky
it's my understanding that the writer of Zero no tsukaima died to death before finishing the show? or was it already done when this happened. (im only on S2)
We can only hope.
But the ending was the absolute best part.
KnK? But KnK isn't a TV anime.
or do you mean that its different because its based on a LN.
Which I understand but I feel like they could still expand on that shit.
Kore wa zombie desuka
Mondaiji-tachi ga Isekai kara Kuru Sou Desu yo?
so easy to spot anime's based on LN
All of them. No anime has ever had an acceptable ending except maybe Usagi Drop for stopping before they ruined everything.
Though really, it needs a lot more seasons.