I'm not sure specifically as 'ultima novel' is a rather general term. It could be about various things like an epic adventure, a complex love story, or a deep exploration of a particular culture or society.
One common theme is the clash of different cultures. When El Tigre crosses over, he brings his own cultural background, like the Mexican - inspired setting of his original story, and it clashes or blends with the new world he enters.
Since we don't know the specific 'ultima novel', it's impossible to name the main characters. If it's a detective novel, the main character could be a brilliant detective solving a mystery. In a family - centered story, it could be the members of a particular family dealing with their relationships and problems.
In ultima online, a revenge story can start from a simple argument between two players. One player might insult the other. The insulted player then decides to take revenge. He could spread false rumors about the other player in the game world, causing other players to avoid the one who insulted him. And he might also try to sabotage the other player's quests by secretly helping the monsters they are fighting against.
Bless Me Ultima is classified as fiction. The author crafted a narrative with imaginative elements and plotlines that aren't based on real, factual occurrences.