Which alien character had the most profound impact on Rick's journey?

Notable Aliens in Rick and Morty
Rick and Morty (2013)
Rick and Morty
TV
Notable Aliens in Rick and Morty poll options
Notable Aliens in Rick and Morty
Rick and Morty (2013)
Rick and Morty
- Birdperson
- Unity
- Krombopulos Michael
- Evil Morty