Only ones that come to mind at the moment (long day, and all that) are the two waitresses (Jirayu and Mayu?) from the Sky Temple restaurant in Kimi ga Nozomu Eien. They were great for the necessary comic relief in this series, and in showing that Narumi had an environment he could be relaxed in. But I wish that they could have stretched out the series by an extra episode or two, to flesh out their backstories, a few hardships that they have to face, and their resolution to it. As it stands, they seem like last minute additions to the series, despite being in the game that the series is based on.
Btw, I'd also list Jirayu (or whoever it was who kept shouting 'Go step in catsh!t'

in the 'Most fiery temper?' thread, if I had remembered.
'Nn I I eh er a I I n was n n n do I believe te pe te it depends on the nature of the question.'