Hideo

Hideo is a mysterious character with not completely known motivations in TFR's Season 4 & 5.

Law of the Observer
Not much is known about Hideo, or if that is even his real name; possibilities are that it's only an alias he took while working from Kojima's shadow.

The truth is that Hideo is a genius writer. However, no one paid attention attention to him and he never got any publishing deals. Somehow, he met Kojima and and made a deal to help him write his work. Kojima's ideas were all disparate and incoherent, but somehow Hideo managed to turn them into something decent. However, when the work was out, Kojima was the one who took all the praise. Kojima's ego couldn't allow anyone else to be praised for his work, so Kojima offered Hideo to keep co-writing, as long as he took on the name of Hideo. Thus, the masterful genius writer Hideo Kojima was born.

As time went on, Kojima's ego grew more and more, and he kept mistreating Hideo worse every time. To make things seem less obvious, he gave Hideo the position of "Producer", but it was more of a glorified assistant, as he didn't really produce anything or have access to funds and only managed them, plus any attempts to direct Kojima would only get him mocked by him. Eventually it came the time when his ego grew so big, he actually started to believe his own lies, treating Hideo even worse, and stripping him of any recognition.

However, he had starting to make plans for turning the situation around, and Kojima's recent obsession with The Final Rumble was the perfect opportunity...

Season 4
Most of S4, Hideo is only referred to as Kojima's Producer. He accompanies Kojima any time he appears, and forces himself to praise him any time he comes up with one of his stupid ideas. However, he was the one who did most of TFR's management while Kojima just came up with stupid shit that forced him to implement on the spot.

Most other people that mentioned Hideo, said there was a "shady air" about him.

Episode 11
When Kojima went absolutely mad with power, Hideo knew this meant Kojima would fall, and started making preparations for taking over, as he had expected from the start.

Once his defeat was confirmed, it was time for Kojima's own writing to shine through.

Season 5
To start, he keeps his managerial position as the General Manager, with the director position returning to Sminem (or maybe OP).

Episode 1
He in the old Kojima Productions office talking to a mysterious man. He mentions something about some preparation for the end of the night, and informing of a conference.

After that, he mentions he's ready to leave this place and move to his new office.