エコアルク
The child version of Arcueid Brunestud shortly after awakening seen in Tsukihime. She's featured in parody scenarios of the Tsukihime Remake series, which is where the name originates.
Eco-Arc is apparently the Arcueid Brunestud of the "Teach Me, Miss Ciel!" world. In order to save costs, she appears as her more economical past self rather than the more cost-intensive future self (as was the case with Miss Ciel ), hence her name.
This tag implicates arcueid_brunestud (learn more).
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