Here's a list of guests I think would be good:
Seiyuu
+KENN (Reborn, Yugioh GX) (He also did the Prince of Tennis Musical so I would love to meet him)
+Sakamoto Maaya (Kuroshitsuji, Gundam SEED Destiny)
+Miyano Mamoru (Wolf's Rain, Ouran High School Host Club)
+Namikawa Daisuke (Kimi ni Todoke, Level E)
Singers
+Matsushita Yuya (Durarara!, Kuroshitsuji) (He has also performed as Sebastian in the Kuroshitsuji Musical)
+Ito Yuna (Gundam00, Nana) (She was Reira in the Nana movies. Her English is superb because she's from Hawaii)
Seiyuu
+KENN (Reborn, Yugioh GX) (He also did the Prince of Tennis Musical so I would love to meet him)
+Sakamoto Maaya (Kuroshitsuji, Gundam SEED Destiny)
+Miyano Mamoru (Wolf's Rain, Ouran High School Host Club)
+Namikawa Daisuke (Kimi ni Todoke, Level E)
Singers
+Matsushita Yuya (Durarara!, Kuroshitsuji) (He has also performed as Sebastian in the Kuroshitsuji Musical)
+Ito Yuna (Gundam00, Nana) (She was Reira in the Nana movies. Her English is superb because she's from Hawaii)