>>49528337
R35M
>>49531850
Sanae would be fun. She has an idea of the outside world which will eventually become Renko's, she has some similar interests and has already gone thru the shock of getting used to Gensokyo. Their personalities would also contrast nicely in my opinion.
Kaguya would also be cool to see. Maribel and Renko already know about the Tale of the Bamboo Cutter. Kaguya, at least in my interpretation of her, seems like she would enjoy Renko's company if only for how exotic she is. Having Renko talk to an important lunarian would work well since a lot of the early album stories were in some way related to the moonies.
But, as we all know, the one 2hu Renko HAS to meet is Narumi.