By this point, many of the users could have been playing for nearly 2 years (on Global) and may have forgotten what character is at what friendship level if they don't use them frequently enough.
So my idea is to add a 15th way of sorting characters: By friendship.
At the simpler side of things, there are 5 states a character can be in (So-So, Acquaintance, Friend, Close friend, Best friend) and would be sorted either from highest to lowest or lowest to highest.
I do not expect the sorting by specific friendship point count, but it would be a nice feature.