Board Thread:General Discussion/@comment-29686889-20180430135630/@comment-26418719-20180705104236

Shovel Knight, Shantae and Quote are not the most likely, nor the best choice for an indie character to get into Smash (Reimu Hakurei of Touhou Project takes that title).

Speaking of Touhou, Bill Cipher's best matchup is with Yukari Yakumo from that series, although it's kinda a spite match since Yukari's boundary manipulation overrides just about anything Bill can do.