There's a sub-branch for MF Bunko J now. Its called MF Books, aimed for older audiences. The first few books came out last month, though I haven't bought any yet. It also seems like Fujimi Fantasia Shobo will be making a similar branch for older readers in the future. Looks like the publishers also want to target older audience now.
Also here's some photo of LN authors. Its not rare to find actual photo of English novel writers, but not many LN author has their face revealed. Well, except Gatou.
First Pic:
Left) Tachibana Koushi(Author of DAL)
Right) Kanzaka Hajime(Author of Slayers)
Second Pic:
Left) Kimura Shinichi (Author of Korezon)
Right) Gatou Shouji (Author of FMP)