Egoist

Egoism is the representation of Egocentrism and is fully centered around his own ego. Everything he does is only to please himself, even if those things are very detrimental to others. He's a rather confident person, knowing exactly what he wants.

The League of Anti-Anti Realists
Egoism is introduced and already shows us his disdain for what he calls "spooks" by refusing to say a catchphrase.

Meet the Off-Compasses
Egoism does not truly approve of the interview but allows the questions to be asked, nonetheless. He is shown to be very decisive and knows exactly what he is okay with and what he is not.

Squirrel!
Egoism has the misfortune of waking up next to a dead squirrel. This shakes him to the core, and he is also then worried about Ingsoc's keys to his room and the fact he apparently has cameras everywhere. This worry seems to go out the door when Darwinism states that it was him and Egoism gets quite mad at the fact that a dead squirrel was left on his bed.

Censurists Antivaxxers Posties and Utopians
Egoism is sent to recruit the Post-Leftist, instead just spending time with xem and arguing. After this, he fails at converting xem, and xe join the realists.

Ideology
Egoism is Off the compass on the Mastery and Individuality axis being Hyper Insular and Hyper Self.

Economic axis
Egoism is True Neutral on the Economic axis.

Government axis
Egoism is Hyper-Libertarian, meaning that his own ego is the only power he accepts.

Physical Description
Egoism is always shown wearing blue clothes in a Victorian style. As he believes that whatever is most ego pleasing is what should be done, he could wear whatever pleases his ego most, and this seems to be Victorian fashion.

Personality
His personality is essentially the same as his ideology, purely based on what he wants. He is the definition of egocentrism and only does something if it would please his ego to do so. He also has an incredibly strong dislike for what he calls "spooks", which he defines as any concept that is not an active decision of an individual, such as ownership of property (not an active decision unless they fight to retain said property) or gendered pronouns (not an active decision unless an ego(person) specifically chooses what they want to be addressed as).

Weapons and Abilities
In The League of Anti-Anti Realists, Realistic realism says that Egoism's weapons are "empty milk bottles and smoke grenades", but also that the main threat of egoism comes from the fact that he can use his ego to justify any of the Anti-Realists' goals.

Trivia

 * Has a cat called Maxie
 * Egoism is canonically trans (FTM)
 * Egoism both pegs and gets pegged depending on what he wants at the time.