The recently released Princess Connect! Re:Dive (プリンセスコネクト！Re:Dive リダイブ) anime RPG mobile game has an impressive voice acting cast, and I'm having fun finding overlaps between it and other series.
Above is a quick chart I made of the considerable voice acting overlap between Priconne and the main cast (plus a few supporting characters) from Hyperdimension Neptunia.
|Asami Imai (今井麻美)||Noire||Yukari Ayase|
|Rina Satou (佐藤利奈)||Vert||Ruka Tachiarai|
|Kana Asumi (阿澄佳奈)||Blanc||Rino Inosaki|
|Yui Horie (堀江由衣)||Nepgear||Saren Sasaki|
|Yui Ogura (小倉唯)||Rom||Kyoka Hikawa|
|Kana Hanazawa (花澤香菜)||Plutia||Aoi Futaba|
|Aoi Yuuki (悠木碧)||Peashy||Suzume Amano|
|Kana Ueda (植田佳奈)||IF||Kurumi Kuribayashi|
|Chiaki Takahashi (たかはし智秋)||Arfoire||Christina Morgan|
|Miyuki Sawashiro (沢城みゆき)||Broccoli||Labyrista|
|Mikako Komatsu (小松未可子)||Tekken||Makoto Aki|
I may have missed some minor characters, but that's the bulk of the main/supporting cast that I'm familiar with, at least from the first few games.
Unsurprisingly, there's a lot of overlap between Priconne with iDOLM@STER, KanColle and Saki as well, but I didn't find the overlaps as interesting as there were more minor characters involved there.
I was also looking for a series where all of the main female ensemble were present in Priconne — I found a couple of series which were one off (Ro-Kyu-Bu!, GochiUsa), but the best I have so far that checks all the boxes is Netoge no Yome (And You Thought There Is Never a Girl Online?) if you discount Nanako.