I have a Green JR pass. I am taking my son from Tokyo to Osaka (Universal Studio). I have a few questions.
- I know Nozomi and Mizuho is not allowed on the JR pass. Is the Hikari the fastest alternative?
- Do you have to make seat reservation in advance?
- If I wanted to upgrade to gran class, how much would I have to pay additionally?
Thank you in advance for helping me understand the JR pass.

