1. Japan: Japan is a parliamentary democracy with a constitutional monarchy. The country has a multi-party system and regular elections.
2. South Korea: South Korea is a democratic republic with a presidential system. The country has a multi-party system and regular elections.
3. Taiwan: Taiwan is a democratic republic with a semi-presidential system. The country has a multi-party system and regular elections.
4. Mongolia: Mongolia is a parliamentary democracy with a semi-presidential system. The country has a multi-party system and regular elections.
5. Timor-Leste: Timor-Leste is a parliamentary democracy with a semi-presidential system. The country has a multi-party system and regular elections.
Other countries in East Asia that are not considered fully democratic include:
* China: China is a one-party state under the rule of the Chinese Communist Party (CCP).
* North Korea: North Korea is a totalitarian state under the rule of the Kim family.
* Laos: Laos is a one-party state under the rule of the Lao People's Revolutionary Party (LPRP).
* Vietnam: Vietnam is a one-party state under the rule of the Communist Party of Vietnam (CPV).