Super Potato is a great retro videogame shop. Jungle has a great selection of retro figures. I can't find it on my map but there was a good lgs within a few blocks of both of those stores we found while wandering. There's just so much cool stuff in that area.

Osaka's got a pretty lively ttrpg scene. There are some cool shops in the Nipponbashi neighborhood that specialize in retro nerd stuff.