While Ainz is a cautious and stingy person, he would always tried to plan ahead and control details beforehand in order to avoid any haphazard actions that can endangers Nazarick's existence. This means going so far as lying to the inhabitants in the New World that he can't used one of his Super-tier spells for years to come after using it once. Since being transferred to a new world and becoming an actual undead being, Ainz could feel himself becoming very cold and calculating while his emotions repressed.

Being the guildmaster of Ainz Ooal Gown, he loves to reminisce about the wise words from his fellow guildmates as they may hold some meaning now in the new world, which the NPCs wholeheartedly agreed too. As he is loyal to his friends and the NPCs created by them, he then acts with a certain degree of nobility, when leading his devoted followers properly, seeing him in the image of a divine entity. It was so they can faithfully have a Supreme Being to look up to and depend on since he is the ruler of the Great Tomb of Nazarick and the last Supreme Being to have stay with them even after their creators have left them behind. He is caring for them like a father figure would as Ainz tries to act that way for Pandora's Actor and his friends' NPCs.

When he was crowned king of his newly-formed country the Sorcerer Kingdom, this trait also plays a certain key role in earning loyalties among his countrymen. For instance, the Guildmaster Ainzach describes Ainz as being a rational person who makes wise decisions carefully, commending him to be an intellectual, but merciful ruler. Additionally, Ainz is open-minded to others' opinions of the actions he has partaken, appreciating their criticisms and learning from his mistakes, in which the Floor Guardians couldn't do to help him.

Furthermore, Ainz is not only look upon as a thoughtful and generous person, but also by the people who work for him while kindly rewarding them with YGGDRASIL items due to their hard-work. At the same time, Ainz is true to his words and oath, when he honorably accepted certain conditions made by individuals in the form of promises held to a high degree without betraying them. He has a benevolent nature of ruling over his nation peacefully without bloodshed, figuring there is still always room for reasonable negotiation. Yet at times however, Ainz would feel paranoid and pessimistic that his Floor Guardians or other NPCs that follow after them may someday abandon him if he doesn't lived up to their expectations.

Nonetheless, he only does things that will benefit Nazarick or himself above all else, whether its information or prestige. Although he does have a sense of justice and doesn't hate humans as much as his followers, Ainz holds no deep attachment to them, and he feels nothing toward their deaths. Ainz did not view humanity as an enemy, but he could kill human beings with no hesitation for the sake of his goals. Even so, he wanted to avoid conflict with other players especially the ones who are human that would protect their kind. After killing Shalltear with his own hands, he became a lot more vigilant and hostile against players or other foes with World Items that could possibly harm Nazarick in the near future. Aside from the NPCs of Nazarick, the only players Ainz will show most concerned for were his past companions.

On the other hand, Ainz has a competitive side to him, regarding the actions of players within the new world was what motivated him to not fall behind in terms of technological development. Likewise, everything he does was all for the sake of Ainz Ooal Gown, the Great Tomb of Nazarick, and the Sorcerer Kingdom altogether. For that reason, Ainz is secretive about the information he may have gain, refusing to disclose anything in case it serves Nazarick's interest. Since Ainz prioritizes knowledge as an utmost importance to him, he also likes to participate in doing random experiments. With the sole purpose of obtaining valuable information on the New World's inhabitants, martial arts, magic, items, or even their way of life such as religion.

In his dark warrior persona as Momon, he is viewed by people to be very dignified as a worthy adamantite adventurer yet not willing to make others uncomfortable around him. True to his nature, Momon is also very faithful and honorable, when he refused Nfirea's request for the Swords of Darkness, prioritizing them first as it was something he accepted before anything else. While he holds great trust with his comrades, he refuses outside aid if they happen to slow him down during his job. Let alone that, he would used some of his spare time to exchange greetings with every single adventurer's group in the Re-Estize Kingdom. Out of respect for his fellow adventurers, he doesn't like to reap the rewards for himself and want them who took part in stopping the disturbance within Re-Estize to be pay equally as well.