Youmu: I will defeat anyone opposing Yuyuko-sama. After all, the things this blade can't cut are... (starts imagining other characters)
Keine: I can just devour the history of ever being cut.
Tewi: I'm a robot from the future, and am made out of adamantium, which cannot be cut by anything. (lies)
Yukari: Slash at me in your dreams, and you best wake up and apologize.
Reimu: As the heroine, I somehow win every fight I'm in, even against clearly superior opponents.
Marisa: Mere swords cannot defeat the magic of love!
Youmu: When you think about it, Gensokyo's filled with a bunch of cheating jerks.
"I think if you put too much magic in your Fantasy it overwhelms the plot, and it starts to make the plot nonsensical. If you do have a sorceress or a wizard who can speak a word and wipe out an army, why would you even assemble an army?"