As Kelvin mentioned, mobility scooters are very rare here among locals (though travelers are making them a bit more common).

If you can do either, go for a wheelchair as it is much more widely understood and accepted. Until recently, scooters were much more strictly regulated on trains. It is much better now, but there are still some narrow…

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I haven’t heard of such, but maybe try DPI Japan. https://www.dpi-japan.org/en/ or maybe Muchu https://www.npo-muchu.com/english-muchu

What length are you thinking of?

As others have mentioned, Tokyo Skytree is very accessible and provides great views.

Shibuya Sky is also accessible with the exception of a few places on the roof that are raised like steps you can sit on. I went a few years ago and did a full walk around the perimeter in my wheelchair. The main route is an escalator to the roof but there is…

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I think @wanping may be able to help as well

Oh dear! What is the brand?

Maybe @ohayotravel can help?