Plain yet oh so powerful

[日巫子]

Nobu, what have you done.

Something amazing.

On-topic:
Komachi's ability is manipulation of distance, right?  She could make a long fall very short, saving you.  On the other hand, she could easily make falling off a table really hurt.

[game2011]

Tenshi and Koishi make better Earth and Heart to me.

[RainfallYoshi]

Shou could bankrupt RInnosuke with her "power to attract treasures". This could also do some crazy things depending on what treasures Shou actually manages to get. Imagine if Flandre happened to misplace her Lavaetein.

Byakuren can use magic to increase her physical abilities. So theoretically she could punch a mountain into pieces or make herself into Gensokyo's Flash.

Nue's ability to use Seeds of Non-Identification to hide somethings true identity could send the world into some chaos. Imagine if she just decided to throw seeds on everything she wanted. Suddenly toilets are hot dog stands and street lamps are giant ogres. Eep.

[Doll.S CUBE]

EARTH, FIRE, WIND, WATER, HEART. WITH OUR POWERS COMBINED...something, something.....CAPTAIN PLANET.

Edit: Ok back to topic.

Edit: continue the fun for a bit then back to topic

[Shizzo]

Cirno can remove the cold of something or someone to make it/them spontaneously combust.

Actually, I think Letty mentioned in her interview that Cirno manipulates cold air.  I guess she can only make something not cold, but not really hot

Letty can control Cold itself, so I guess she could do this, not Cirno.  Plus, I think you can't make something burn without cold, as heat's an energy..

Although I think that if it was the oposite power (Manipulation of heat), one could take all the heat away and completely freeze something..

(Man, this just popped up on my mind and I'm scared; I hate physics!)

[The Greatest Dog]

Reimu has the ability to fly freely...

Apparently, as Fantasy Heaven shows us, she can also fly away from reality, making everyone's powers basically moot...

For... thirty seconds? Then again, she has to put that power into the spell card rules, so she could probably sustain it for much longer (since any more than 31 seconds and nobody could capture it.)

Actually, no, she probably couldn't destroy anything with the level of power as nuclear fusion.

[Kirin]

Reimu's Fantasy Heaven is controlled by her. She can use it as long as she wants, she just uses it for play. If she should ever get serious, it's very likely that she's basically invincible.

On the note of something that sounds plain but could potentially be really powerful, a friend of mine once mentioned 'waves'. Normally, one controls waves of water to drown and crush the enemy, but pushed, the waves of time can be stopped, and the electrical wavelengths of your nerve impulses can be destroyed. You can be deafened as sound waves stop reaching you and the light wavelength basically disappears, leaving you blind. Waves of damn near any element (Patchy style) can be used as well, so... This actually sounds really damn powerful.

On that note, what is the proper definition of Shikieki's power? Can she decide between right and wrong? Or was it black and white? And I'm not exactly sure how powerful that ability'd be, could someone explain for me? The only way I can see her power being truly 'PBP' is if she has the ability to judge between yes and no, or truth and lies. What exactly she can judge is what will make up my mind on her power.

[atoms2ashes]

Murasa and Kanako...fusion...

...Oh god, what HAVE they done?!

[Vicks]

Murasa and Kanako...fusion...

...Oh god, what HAVE they done?!

You get The Flying Dutchman from POTC.

[Chronometer]

...

On the note of something that sounds plain but could potentially be really powerful, a friend of mine once mentioned 'waves'. Normally, one controls waves of water to drown and crush the enemy, but pushed, the waves of time can be stopped, and the electrical wavelengths of your nerve impulses can be destroyed. You can be deafened as sound waves stop reaching you and the light wavelength basically disappears, leaving you blind. Waves of damn near any element (Patchy style) can be used as well, so... This actually sounds really damn powerful.
...

I'll just quote a professor of mine: "You are an electromagnetic wave"
Short explanation (I might be terribly wrong, quantum physics isn't really my strong point): According to de Broglie's wave-particle duality, basically any moving matter can be described as a wave, in accordance with the formula λ = h/p (λ=wavelength, h=plank constant and p=impetus). This is especially interesting if you consider the Heisenberg uncertainty principle, which states that you cannot measure the speed and the impetus of an object at the same time, or only with so and so much uncertainty (formula: ΔxΔp≥(ℏ/2)). I remember a task where we had to calculate the uncertainty of position of a car moving with 100 km/h compared to the uncertainty of an electron and well, the uncertainty of the car was quite negligible.
Nevertheless you could theoretically calculate your own wavelength (given that you're moving) and define yourself as a wave. The wavelength  λ would be very small indeed, but still a wave. What could follow is left to your imagination _{I already regret writing that, someone will give me shit for being wrong... well, that's what happens if you hear about stuff without understanding it and goddamit, it's Touhou, there's no physics behind it...}

@topic: I hope I can be forgiven to not add anything substantial to the topic, since I can't think of anything which hasn't already been said ~~ Oh well, let's see what I can come up with:
-Rin Kaenbyou: Power to carry away corpses. Is there a way to misunderstand that so it could be insanely powerful? I for once can't
-Yuugi Hoshiguma: Power to control supernatural phenomena. Basically anything we can't explain/can't be explained. Have fun thinking about it (I surely won't)
...

[Hello Purvis]

Clearly Yuugi is Yog Sothoth.

[KrackoCloud]

Yukari can control the border between victory and loss to always win fights :U
Reisen might be able to control heartbeats, which are often portrayed as waves. She could also control radiation waves, seismic waves, ocean waves, and probably lots of other stuff.
Komachi could create distance in a relationship? She could also create chaotic inflation or something, which would be cool.
Nazrin and Shou could have the ability to find/attract anything so long as someone thinks it has worth (treasure)?
Yuyuko could invoke the death of a concept or idea?

It's already hard to discuss a lot of characters, because so many already have explicitly broken abilities.

Now, I'm wondering how Sikieiki's power could be broken. The ability to judge things absolutely doesn't really have any practical destructive use, does it?

[Nobu]

-Rin Kaenbyou: Power to carry away corpses. Is there a way to misunderstand that so it could be insanely powerful? I for once can't

Rin could change the face of the world by altering ecosystems and foodchains, hoarding all the slain animals so carnivores eventually starve and die out, leading to an overpopulation of herbivores and a domino effect that leads to the END OF THE WORLD.

Alternatively, she could just do things the medieval times way and use corpses as weaponry to spread disease and demoralize opponents.

[AJS]

I'm surprised no one's mentioned Flandre yet.  I mean, come ON!  "Destruction of anything and everything"  If she really wanted to, and perhaps if she refined that ability, she would literally be invincible.  She could destroy any bullets, projectiles, or any other threats that were coming towards her.  She could instantaneously destroy her enemies instead of "fighting" them.  In fact, she could probably even destroy the whole Earth just like that. 

[Hello Purvis]

The problem with that is you tend to have to be fast enough to realize you're being shot at, figure out where it came from, and then counter it. It's only as good as your processing speed when you using it to stop something.

[OkashiiKisei]

Yukari can control the border between victory and loss to always win fights :U

Expanding on that, Yukari could use the border of strength and weakness to nerf all her opponents, border of shape and form to to change the opponent into a harmless lil' creature or use the border of existence and non-existence to utterly erase her opponent.

[trancehime]

Nazrin and Shou could have the ability to find/attract anything so long as someone thinks it has worth (treasure)?

So two entities alone have the ability to manipulate the economy of the entire world.

Somehow.

In a roundabout way.

That's vaguely scary.

[Solais]

If we can expand on the idea of Sanae granting miracles, even if Yukari changes the border of win and lose, it would be a *Miracle* to win against her, thus making Sanae's power as the "power to counter everything". The Universe is being destroyed? It only needs a *Miracle* to save it! So on.

[AJS]

The problem with that is you tend to have to be fast enough to realize you're being shot at, figure out where it came from, and then counter it. It's only as good as your processing speed when you using it to stop something.

In the real world, that'd be a problem, but in the world of danmaku, it's easy to spot and identify incoming projectiles.  :V