Platonic:
Marisa/Rinnosuke, or Rinnosuke/Marisa. one sided things turn the stories more interesting and aww.
Sakuya/Remilia.
Meiling/Sakuya.
Renko/Maribel
Keine/Kourin or Keine/Mokou (the normal Keine and EX Keine XD)
Sariel/Kourin (my personal OTP)
Marisa/Mima
Yukari/Rinnosuke (i think who this is more like molestation, but oh well XD)
UFO bosses/Byakuren
Cirno/Letty (more like admiration)
Saigyou Ayakashi/Yuyuko?s father. because Saiyouji (the poet) wanted be buried in exactly down THAT tree? maybe the poor tree was in love with him, but how is a tree, that is impossible...but the poet understand his pain and wanted lay to his side together for eternity?
Goliath Doll x Hisoutensoku
this one too. is Awesome!
Romantic
Youmu/Yuyuko because is so sweet. i collect doujins with this pairing.Even the ero ero. A classic pair of master-servant with samurai touch.
Koakuma/Patchouli
Yukari/Ran because looks like their relation, with their problems, is solid even the centuries.
Wriggle/Mystia because one brings light (is a firefly) and the other brings darkness (when sings)...
Sikieiki/Komashi because is incredible how many patience have Siki with Komashi. their love is more big than the Stix river, then. XD
Marisa/Reimu i don?t know why, but i like love with polar personalities.
Mystia/Mokou thanks to that pixiv doujin.
Marisa/Rinnosuke but when Marisa is adult.
Youki/Rinnosuke because my fujoshi roots and then we have lots of interesting points: nanshoku-samurai male love traditions, generational discutions, tsundere males, an answer for the "not interest of females" from one of them and the misterious "lost dissaparition" of the other etc. bored of yuri or het in Touhou? here is another flavor. I see them like two lovingbirds, with a long but secret relation who nobody knows.
YuugenMagan/Evil eye Sigma because the two are eyes,use eyerays for attack, the two remind demons from the Solomon Key, no have human shape, Yuugen Magan means "magic eye" and a "evil eye" is a talisman, a magic eye too...(i like draw then with gijinka style, Yuugen like a imp who looks shota but have 500 years (and very pervert) and Sigma like a newborn tsukumogami from himself (with tentacles in his back, fufu) but, how Sigma is 18 ,two times 9...is too naive.
Sariel/Rinnosuke, even the angst in the end (angels can?t die, fallen angels can?t die waiting for the end of the world, when finally they will destroyed...) but maybe Kourin?s soul no is the same like a normal human soul...will probably be together in that moment? nobody knows... more bittersweet things.
Suika/Yuugi, because why not?
Yuugi/Parsee thanks to all that fanarts.
conclusion: i love bl,gl and het with lots of love!