Most of the ops I like are mainly because of the songs but sometimes the things that go on I like too.
To name a few. Angel Beats!,the first Shippuden op,Kanon 'o6, and Infinite Stratos. I got some others I like but I can't remember lol.
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"It's not important to have a long life, the important thing is to have a happy life with your beloved ones"
I would list my favorite anime openings but i don't have any. I love a lot of anime openings and if i had to choose it would take weeks for me to come up with my favorie opening. but if i really had to choose i would choose fairy tail opening 11 because the song is really up beat.
To me the best ones are Anohana's and the one from Stein's Gate. I never skipped them.
“The unreal is more powerful than the real, because nothing is as perfect as you can imagine it. because its only intangible ideas, concepts, beliefs, fantasies that last. stone crumbles. wood rots. people, well, they die. but things as fragile as a thought, a dream, a legend, they can go on and on.” - Chuck Palahniuk