Dakkan said: So playable would be Hisou Tensoku, Goliath Doll, Unzan, Mega-Suika, and... hm... Evil Eye Sigma. Can't think of who else, unless only 5 is ok.
You forgot the Catfish!
If we count fangames, I can think of Yumemi's Chairs Robot from Touhou Soccer, Patchouli Robo from several games, Yakagoro Daioh from Touhou A Live, the Giant Mushroom from NSML, and Neo-Yukari from Defiant of Shrine Maiden.
If we count fangames, I can think of Yumemi's Chairs Robot from Touhou Soccer, Patchouli Robo from several games, Yakagoro Daioh from Touhou A Live, the Giant Mushroom from NSML, and Neo-Yukari from Defiant of Shrine Maiden.
There's also the giant fairy-eating frog from Bohemian Archive. And I imagine Nitori wouldn't let a giant mecha battle rage on without bringing something of her own to the table.