[DrillBIT]

Information so far:

Krim developed the Core Drivia system. A powerful power source. (TV)
Banno developed the Roidmude. (TV)
Odagiri developed a system that could change the concept of death. Most likely mind/memory transfer. (type Tokujo)

Banno has trouble in getting the Roidmude to work. Krim gave him the Core Drivia and installed it in Roidmude 001, 002, 003. (TV)
Krim is too old to transfer his mind into Cyberroid ZZZ, so he hid it inside an old castle (Lupin movie). Cyberroid ZZZ is an upgraded type Roidmude with an empty mind waiting for somebody's brain dump.
Chase called himself an upgrade type Roidmude in episode 25. Most likely a prototype for testing the Drive System and something like ZZZ. (TV)
Harley developed the NEX-Core Drivia System. (TV)
Brain looked at his pad device and said everything is Banno's fault while Shinnnosuke and the others investigating Odagiri's relationship with Banno. (type Tokujo)

Kiriko and Gou are Banno's kids. Kiriko knows nothing about her dad's work, but Gou knows it.
Otta, Krim and Nira knows about Shinnosuke's dad's death, but hides it for some reason.
Saijou knows about Odagiri.
Roidmude are looking for suitable people with great hate to fuse with. Gou most likely be one of them.

Just a thought.
If all Cyberroid type requires a mind transfer to work (like Lupin), Proto Zero may also need one as well. Proto Zero may not be running on simple programming created by Krim.
Chase lost his memory, but still "obeys" the protocol "to protect people". His mind donor must be doing the same as well.
So far there is no lead to who Chase's mind donor really is until lately. Shinnosuke's dad may be the candidate since both Krim and Otta knows about him.