>>10728377They seem to fit fine. They seem a little small in there but I think it still looks ok. If you don't attach their hands to the handlebars, they'll kinda slide around in there because there is a lot of room.
With regards to the harness I can't place it on Asagi that easily unless I pop her head off but even then her hair gets in the way trying to reattach her head. The seatbelt is not tight fitting at all.
Shorthaired figures will be ok with the harness.
The larger figures like Second Axe and RomanKey will sit fine. Figma is too small.
I mean Sophia looks ok sitting there but if you look closely her butt isn't even touching the seat, which is a result of her arms being too short while holding the handlebars. I guess you can get away with it by hiding those angles.