It would be fun to play Snarby in T3, or RT in T1. It would give a fun challenge to some players playing more T3 bosses or easier versions.

Snarby:
T1- Snarbolax
T2- Wild Snarbolax
T3- Stalking Snarbolax

JK:
T1- Jelly Prince
T2- Jelly King
T3- Jelly Tyrant

RT:
T1- (can't decide)
T2- Roarmulus Twins
T3- Auguster Twins (Augustus, King of Rome)

Vana*:
T2- Knight Vanaduke
T3- Lord Vanaduke
*no T1

Bosses of lower tiers subtract the # of tokens by 2. Higher tiers add 1.