Zero Kiryu

Zero loses to Yuki. Zero is always played face-up.
When played, reveal the top card of the opponent's GY; put the target at the bottom of that GY, gain that power and activate the typed effect:
{u/r}: Flip opponents' boss right-side-up, discard all played cards.
{r/w}: Play different card at -1 from hand/top of GY
{g}: Can't win, only lose on ties.
{u}: Flip both bosses upside down, discard Zero.
{c}:+1, you can't play Zero for 2 turns.