Danbooru

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cirno-nee

チル姉

An older version of Cirno on pixiv known as Cirno-nee [チル姉] usually depicted wearing a yellow or orange scarf and a more mature demeanor, and sometimes has red-blue heterochromia. This version of Cirno appears on good terms with Remilia Scarlet and the other residents of the mansion.

(taken from Cirno Wiki)

Ricia(リーチャ) popularized the use of Cirno-nee with his Video manga series on NicoNico Douga.
http://www.pixiv.net/member.php?id=226209

As far as Ricia's Doujin goes, Cirno-nee is on really close terms with Remilia Scarlet as well as the rest of the Scarlet Mansion. Remilia and the Scarlet Mansion is also on friendly terms with the Makai residents such as Shinki and Yumeko. Sakuya deeply looks up to Cirno-nee as a sort of big sister character. While Sakuya-chan is still a child, everyone pretty much dotes on her causing her to be a little spoiled.

Other than wearing her traditional canon clothes along with just a yellow Scarf, Cirno-nee is also sometimes wearing a ⑨ hoodie and wearing her hair in an up pony-tail.

This tag implicates cirno (learn more).

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2girls ;) absurdres arm_at_side bad_proportions bikini bikini_tan blue_bikini blue_eyes blue_hair bow breasts child cirno cirno-nee cleavage cropped_legs dual_persona flat_chest flower food hair_bow half_updo hidden_star_in_four_seasons highres ice ice_wings large_breasts long_hair mouth_hold multiple_girls navel older one-piece_tan one_eye_closed plant popsicle pushun_(muteki) short_hair sketch smile sunflower swimsuit tan tanline tanned_cirno touhou vines wings
1girl blue_dress blue_eyes blue_hair bow cirno cirno-nee dress hair_bow ice ice_wings konosuke_dagame long_hair long_sleeves looking_at_viewer scarf simple_background smile solo touhou wings
2girls aoi_(annbi) bat_wings blue_bow blue_eyes blue_hair blush bow cirno cirno-nee dress hair_bow hat hat_ribbon highres ice ice_wings looking_at_another mob_cap multiple_girls pointy_ears red_ribbon remilia_scarlet ribbon scarf short_hair simple_background standing touhou white_background wings yuri
(9) 4girls 4koma bandages birthday_cake blush_stickers breasts broom cake chamaji cirno cirno-nee comic daiyousei directional_arrow evolution flying_sweatdrops food gameplay_mechanics hat highres ice ice_wings kirisame_marisa komeiji_satori medium_breasts monochrome multiple_girls multiple_persona older parody pink_hair pokemon su----per_cute touhou transformation translated wings witch_hat