Game concept
Innovator
The game also links it as Innovators.
From the game's encyclopedia
Innovators are Guests at the Ecumenical Council Activity voting with the Host in their suggestions to change status of a Tenet or a Doctrine.
They are directly opposed to the Conservatives, guests who are voting against any changes, wanting to preserve the status quo.
Characters that are allowed to vote are: Clergy, Rulers with Realm Priest Puppet and the Activity Host
The game's text for patch 1.20.1.2. Words in blue are entries of the encyclopedia: hover one to read it, as in the game.
Innovator is an entry of Crusader Kings III's in-game encyclopedia. The game explains it: "Innovators are Guests at the Ecumenical Council Activity voting with the Host in their suggestions to change status of a Tenet or a Doctrine." It is part of Activity. The game also links it as Innovators. Patch 1.20.1.2, from game/common/game_concepts/pam_game_concepts.txt and game/localization/english/game_concepts_l_english.yml.
Source: game/common/game_concepts/pam_game_concepts.txt, game/localization/english/game_concepts_l_english.yml and the English localisation, Crusader Kings III 1.20.1.2.