I looked into this topic and as far as I can tell on the rare occasion that an organism doesn't fit into a kingdom they create a new one. However there are so many kingdoms that it is very unlikely that an organism won't fit into one.
Firstly, could it fit in as a prokaryote? Otherwise, I assume there would be a meeting of scientists to decide whether to create a new categorization.
Archaea
Domain Eukarya consists of the most kingdoms of the three domains.
Eukarya is the domain of classification for eukaryotes.
All protists belong to the taxonomic domain of Eukarya, members of which are characterised by having cells with nuclei. Eukarya covers all organisms in the Kingdom Protista, as well as the Kingdoms Plantae, Fungi and Animalia.
Mitosis is a process that occurs in the kingdom of Eukarya. Eukarya is one of the six kingdoms of life, which also includes Archaea, Bacteria, Protista, Fungi, and Animalia.
Archaea
If scientists discovered organisms that did not fit into any of the four kingdoms of the domain Eukarya, they would need to conduct further research to understand their unique characteristics and evolutionary origins. It is possible that these organisms may represent a new domain or a divergent evolutionary lineage, leading to a reevaluation of the existing classification system. More detailed molecular and genetic analyses would likely be needed to determine their placement within the tree of life.
Domain Eukarya consists of the most kingdoms of the three domains.
The six kingdoms are Animalia (Domain Eukarya), Plantae (Domain Eukarya), Fungi (Domain Eukarya), Protista (Domain Eukarya), Archaea (Domain Archaea), and Bacteria (Domain Bacteria).
Well... The four Kingdoms in the domain Eukarya are Animilia, Protistia, Plantae, and Fungi.
Animalia. (Eukarya includes Protists, Animalia, Plantae, and Fungi)
Protista. Plantae Animalia. Fungi.
The domain "Eukarya" can be divided into four kingdoms: Animalia (animals), Plantae (plants), Fungi (fungi), and Protista (protists).
Protista, Fungi, Plantae, and Animalia
Eukarya is the domain of classification for eukaryotes.
Domain - Eukarya Kingdom - Animalia
The domains are Archaea, Bacteria, and Eukarya. The domain Archaea has one kingdom: Archaea. The domain Bacteria has one kingdom: Bacteria. The domain Eukarya has four kingdoms: Protists, Fungi, Plants, and Animals. There are a total of 3 domains and 6 kingdoms.