Well, Sebastian and Ariel&Flounder are not in the Global game yet, but they should be after the holidays! They both do the same thing - +3 Str for 1 turn - and are basically iKairi minus the heal. Where Sebastian’s special cost is crazy high, A&F is the same as iKairi. Since iKairi and A&F/Seb can’t stack, there’s really no reason to have two.
However! Skills are important! If you have Sebastian with a Cost 1, you could have an iKairi with a Defense Boost 3 or a Second Chance. Or if you get A&F, you could use DB3 on that and Cost 1 on iKairi. In this way, having multiples of essentially the same medal can be very useful!
In the JP version, Seb and A&F are from a high score challenge, similar to the TWEWY one. I think you’ll probably get Sebastian without even trying! A&F will be another story.
In short, yes, it is good to have both! It’s always good to have more options. But Sebastian won’t be essential to you the way it will be to players without iKairi.
Hope this helped!!
<3 KCM
Illustrated Kairi
(Alternative Title: The Worst Luck in the World)
((Pics 2 and 3 are swapped for the visual appeal))

