Ogma is a god from Irish mythology, a member of Tuatha Dé Danann. He is the inventor of Ogham, the script in which Irish Gaelic was first written. To this day, you can see Ogham stones in Ireland, Wales and Scotland. Ogma is a god of poetry and eloquence, but first and foremost, he is a warrior, and as such, his attribute is a club. He was so fierce that during a battle he had to be chained and held back by other warriors until the right moment.
Sequoyah is the only real person here. He was an illiterate Cherokee Indian, silversmith by trade (do you see a jeweler’s hammer in his hand?). He had to interact with white people, selling them his ware, so he noticed “talking leaves” that allowed his customers take notes or remember things. He vowed to create a similar system for his tribe. He didn’t have much support – Indians believed that writing was either a hoax or sorcery, but Sequoyah was persistent. First, he came up with a system of one symbol for each thing or a concept, much like hieroglyphs. But there were just too many things around, he became frustrated trying to invent and remember a glyph for each one. Anecdotally, he spent so much time thinking about it that he forgot to tend to his fields, and his wife had to beg their neighbors for extra food. His friends and neighbors pitied his family as they thought he had lost his mind. But, in the end, Sequoyah came up with a syllabary of 85 characters. After seeing its worth, the people of the Cherokee Nation rapidly began to use his syllabary and officially adopted it in 1825.