If you want more Vivi friends or specific friends in general, refresh the guest list by backing out and run through the 0 stamina island. Do this as many times as you need until your friends list is full of more useable friends.Cleared Kuro Expert yesterday with a slasher team. I just used a gem and got one back in return, so it's a wash. But I got a Sogeking skill book, so I guess it wasn't a total loss.
Got a friend request while I was asleep from someone with a Princess Vivi and when I went to accept, their friend list is full. poooooooop
If you're on a PC, couldn't you just edit the best guys into your set?
Pulls, rolls and your roster are saved server side. No way to edit who you want in.
Just a FYI. Expert is doable with any team if you have a 35+ Princess Vivi friend and about 6000-7000hp. The better the team the faster it is. I've beat expert with 3 different teams. Longest was over 20 mins, and shortest was around 10.