 If you liked
No.6
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 ...then you might like
Orenchi no Furo Jijou
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Both animes have a serious dark haired character that takes care of a supposedly ditzy guy. Although in OreFuro the other MC is actually an airhead. Both animes have a strong BL feel, with No. 6 actually having a canon romantic element, OreFuro is just a HEAVY (I mean heavy!!!) bromance.
They are both on the edge of a bl anime, no. 6 has some (2/3?) kissed between the two main characters, but it was never really declared that they where in love. And Orenchi no Furo Jijou is sort of bl, there are no kisses or romantic moments between the two mains but it gives of that vibe.