Eureka
Furude Rika
Mihama Chiyo
Nagi
Sanzenin Nagi
Tsukamoto Tenma
Pedo bear
Koiwai Yotsuba
Hatsune Miku
Hirasawa Yui
Rebecca Miyamoto
Yoko Littner
Izumi Konata
Suzumiya Haruhi
Shana
azumanga_daioh christmas crossover eureka eureka_seven furude_rika group guitar hat hatsune_miku higurashi_no_naku_koro_ni hirasawa_yui instrument izumi_konata jpeg_artifacts kannagi_crazy_shrine_maidens koiwai_yotsuba k-on! lucky_star mihama_chiyo nagi pani_poni_dash pedobear rebecca_miyamoto santa_costume santa_hat sanzenin_nagi school_rumble shakugan_no_shana shana suzumiya_haruhi suzumiya_haruhi_no_yuutsu tengen_toppa_gurren_lagann thighhighs tree tsukamoto_tenma vocaloid yoko_littner yotsubato!

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Pedobear would definitely approve of this Christmas crossover
Added notes for the girls, not sure about the pets.
The cat on the mantle is from Lucky Star. It's shown between the first and second halves of the episodes and right before the Lucky Channel segment. I don't think it has a name.
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