What's the most advanced tech suit a millionaire could build to become a vigilante?

[Lucian]

A millionaire with a fortune of 900 million dollars wants to build the ultimate vigilante suit that could allow a skilled fighter to fight crime on dark alleys at night and escape the police.

He is insane and is willing to spend all his wealth on creating this suit. His plan is to hire skilled engineers in a secret facility. All the required materials would be purchased to the degree they are available on the market.

What are the maximum sci-fi features he could achieve to add to this suit for this budget?

What amount of protection could be achieved against ballistic threats?

What level of bulletproof protection could the suit provide for the head, face, torso and members, and still allow it to be light enough to be worn by an average man?

Could the suit be made to achieve flight in any way?

What kind of automatic weapons could it include? Could it withstand explosions?

Could it be digitalized/augmented with AI like the Iron Man suit?