The Protist Kingdom consists of mostly unicellular organisms that can have characteristics similar to plants, animals or fungi. Characteristics of Protists: mostly unicellular, few multicellular, eukaryotic, can be heterotrophic or autotrophic.Ex: algae, Paramecium, kelp (multicellular).   . kingdom of mostly Multicellular organisms that obtain energy by breaking down substances in their surroundings and absorbing them. Characteristics of Fungi: mostly multicellular, eukaryotic, heterotrophic. Ex: mushrooms, bread mold (Multicellular) yeast (unicellular).