Who can be a shareholder on Japanese company ? Anyone can become shareholders.
Amount of initial capital is very important. Under the Japanese law, you can set up a company with 1 yen initial capital. However, I do not recommends to establish your company with 1 yen capital because your customer, vendor or bank will not trust your company if the initial capital is too low.
From visa perspective, initial capital of your company must be 5 million yen or more to apply for the Business Manager visa.
From consumption tax perspective, a new company is exempted from consumption tax return for the first two years. However, if your company’s initial capital is 10 million yen or more, your company needs to file consumption tax return from the first year.
Please talk with tax accountant before you incorporate your company!