Most of the "look alikes" in the OP were not that similar in my opinion... Especially the one with Etna and the Strawberry Panic girl. o.O That seemed very forced.
Hmm... The first characters to come to mind for me are Mikuru Asahina from Haruhi and Yumemi Hidaka from Munto. And when I realise that they are both Kyoani characters, it hits me that almost all recent Kyoani characters look similar due to having the same art style and bland hair colours. ._. Haruhi and Munto aren't recent, though.
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