I'm familiar with the concepts of seme and uke, but I had no idea they came in so many flavors.
Could someone expound upon what a 強気攻め (strong seme) and へタレ攻め(lazy seme) are?

I can see Jumbo as a lazy seme, but rather than Koiwai, I think Yanda would make a better strong seme.

Thanks for "top." I knew there was an English equivalent of seme/uke, but I kept thinking "pitcher and catcher."

That translation is mostly copied out of the official Genshiken translation, by the way.

Ha ha ha, this is a page from Genshiken.