User blog comment:Crimson and Darkness/Volume 25 discussion blog/@comment-3965848-20180516212727

Interesting topic: who would be the Best Man for each of Issei's weddings, my guess is:

Asia - BM: Gorou Hyoudou

Akeno - BM: Tobio

Rias - BM: Either Matsuda or Motohama, since they know they're together and it be weird to tell them about the others.

Kuroka - BM: Vali

Ravel - BM: Riser

Koneko - BM: Kiba

Xenovia - BM: Saji?

Le Fay - BM: Arthur

Irina - BM: Touji Shidou?

Elmenhilde - BM: Gasper?

Rossweisse - BM: ??? Really don't know, maybe someone could go twice perhaps?