In video game development, the person who oversees and directs the entire design team and is the key vision keeper is the

The Lead Designer

Explanation:

The Lead designers main role is to oversee how a game looks and is played. They manage a, normally small, design team. They work with them to come up with many aspects of the game itself like; characters, props, and plots to the game. they also, makes sure that the team itself stays on track, is within budget, and meets the designated deadlines.

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