Closing as duplicate.  Please vote for the existing issue.

https://pricecharting.userecho.com/communities/1/topics/894-adding-a-friend-feature

This is added now.  Closing.

Which toy lines would those be specificially?

Thank you.  We do not track language specific games yet, but this request will be a good one to see how popular the idea is with other users.

Added.

https://www.pricecharting.com/game/pal-playstation-2/jello

Added.https://www.pricecharting.com/game/pal-playstation-2/tt-superbikes-legends

I don't see any info about this version.  Can you upload a photo of it?

Done.