Dunno. A driver for 19.99USD?!? No, no, no! One question, do you buy the rubies? If yes, and you try to get him spending those rubies, buy it, or simply don't have it.
Super Mario Boards
mistery juice
Yoshi! Yoshi!
I've paid for Black Yoshi, Red Yoshi, Ice Mario, and Pink Shy Guy. But that's because they were paywall exclusive.
Shoko
Dry Bowser isn't paywall exclusive however. He appears occasionally in the daily selects of the shop for 12,000 coins. I'd save your coins and put aside enough to pay for Dry Bowser the next time he's in the shop.
Mcmadness
absolutely not.
Xiahou Ba
Don't give into temptation, a character in this game isn't worth it. 20 bucks can buy you so much more worthwhile stuff.