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Cirno is an ice fairy. While she is described as a weak boss in the Touhou series, if we consider the power of average fairies - who appear often as regular enemies - we can certainly say she is exceptionally strong for her kind, and she is implied to be so in Phantasmagoria of Flower View by Eiki Shiki. Her personality is childish and rather incompetent, as you might expect from her appearance.
During the events of Embodiment of Scarlet Devil, she attacked the player, who was just passing by, likely to test her strength.
In Perfect Cherry Blossom, she returned as the midboss of stage 1, presumably to challenge the player character again to prove her strength.
In Phantasmagoria of Flower View, Cirno aimlessly wandered about, apparently unconcerned by the flower incident for any reason other than the flowers being something else for her to freeze and play with.
In Hisoutensoku, Cirno was intrigued by what she believed to be the great Daidarabotchi and hoped to tame it so that she won't be afraid of anything anymore. She showed her intelligence by admitting that she is incapable of defeating the Daidarabotchi if it lives in the hot spring's boiler, since it is too hot for her.
After the events of Strange and Bright Nature Deity, in Fairy Wars, Cirno tries to find those responsible for destroying their house. Learning that it was the Three Mischievous Fairies, she goes in search of those responsible, which she defeats easily though they all challenge her at once.
After this "incident", Cirno wanders around for a while, bored of what she perceives as weak opponents. While wandering, she encounters Marisa Kirisame, making Cirno think she is a worthy opponent. They battle, and later, Marisa pauses and realizes that Cirno isn't as much of a pushover as the usual fairy, so she increases the power of her attacks.