Tsuyu's future skill set.
It's been 13 seasons since the introduction of skill sets, with only 11 s1 characters getting them (not counting the 3rd sets). Who's the next s1 character to get one?
To get into my theory.. let's account for the accuracy of Zol's thoughts about the trends of heroes and villains being in the same season for the same role, if Mirko is next because of the post from the twitter account..then next season will be 2 rapids since Strike, Assault, and Tech already happened. Now who's with Mirko doesn't matter.. who's after does.
Since we're left with a double support being needed.. the only villain that does anything support related is La Brava with her love for Gentle, now if it's them or not it truly doesn't matter besides their role, and since Tsuyu has been called a support because of her SpA, and with her recent buff.. support Tsuyu is very very possible. For her to get a buff to her Special which accommodates to both sets.. it might be soon, who else would even fit the support role?
Of course the trend could stop for heroes and villains.. but I don't see the roles trend will stop, I see it continuing until all roles have been filled out. There you have it, my s18 Tsuyu skill set prediction, she's long overdue so it just seems right. :p