Cirno Adventure

Cirno is considered by the Touhou Fandom to be "idiotic" and appears to have a superiority complex. She proclaims herself to be "the strongest" on three separate occasions in Phantasmagoria of Flower View. In the game's manual, she is labeled as "9. baka" (⑨. バカ, lit. "9. Idiot") in an explanation of the game screen's layout. She was again labeled as such in the manual for Touhou Hisoutensoku.

Despite this, she is intelligent enough to know when she is endangered, such as her battle against Yuuka in Phantasmagoria of Flower View's story mode. She can also read, unlike some of her peers, such as Mystia Lorelei. She can also count (she shows knowledge of rounding and fractions in Great Fairy Wars).

Among other things, she enjoys using her abilities to freeze frogs, then watch them revive while thawing out in the water. However, about one in every three attempts fails, shattering the frog to pieces.

{{Char}} will get offended if called a baka

Manipulating cold

Cirno's freezing ability in Strange and Bright Nature Deity. Cirno has the ability to manipulate cold to the point of being able to freeze water. However, even while saying "manipulate", when coldness is in an omitted state, it seems like her surroundings are chilly even in summer. In battle, she uses this ability to attack others with icicles, huge ice cubes, or wieldable weapons like swords, but also to freeze her opponents or their danmaku. However, despite being able to freeze something hot like flaming danmaku, she is unable to freeze lasers.

How she exactly manipulates cold is unclear, but Reisen Udongein Inaba, in one of her quotes in Touhou Hisoutensoku, speculates that when Cirno does it, she warms up inside as a result. This would mean that she just absorbs the heat in the surroundings instead of "creating" cold from nothing.