Lo'ak Sully

Lo'ak is the black sheep of the Sully family who feels like a stranger within his own family and clan. Neteyam is seen lightly teasing him while Kiri claimed she hated him when they were children, calling him a "penis face". Even when Kiri is older, she still lightly shoves him out of her way in a somewhat cold manner. Lo'ak even goes so far to tell Payakan that he's all alone, even though his family is present at the village.

Because Neteyam was favored by the clan, Lo'ak has faced more social isolation and deprivation as a result. He became self-conscious because he resembles a human, having five fingers instead of four as well as eyebrows. This has made him somewhat of an outcast with the Na'vi since many have viewed him as being more human than Na'vi. No mention is made of any friends while living in the forest with the other Na'vi. Lo'ak instead identifies with outcasts like Payakan.

Lo'ak is never shown to being particularly fond of either the Na'vi or humanity, even using the Na'vi word for "demon" to refer to humanity when he uses the phrase "demon ship" (i.e. the SeaDragon), although he is only ever seen calling humanity demons after learning what the RDA did to the tulkun. The Na'vi view Lo'ak like an alien, and Lo'ak does feel like one at times on Pandora. This feeling, a lack of belonging, is not too dissimilar to how some mixed-race people feel; instead of feeling special and part of both worlds, they can feel as if they are neither and as if they are a different species. This is why he has a completely opposite reaction to Kiri when Ronal accuses him of not being a true Na'vi; Kiri shouts "Yes, we are!" but Lo'ak instead stares off into the distance in silence.

Adding to Lo'ak feeling like he does not belong with the Na'vi, it is notable that Lo'ak is never seen praising Eywa and he may be interpreted as being a more irreligious character who is apathetic towards traditional Na'vi spirituality, contrasting Kiri who feels extremely connected to Eywa. When Lo'ak and Kiri visit the Tree of Souls, Lo'ak instead watches her pray at a distance. Lo'ak is skeptical of Eywa's abilities, saying, "I don't think praying is going to do much against starships." Tuk tells Lo'ak her opinion that only Eywa can save them. It does not help Lo'ak's loneliness either that Lo'ak has never been portrayed as having any hobbies or talents while in the forest, since the Omatikaya clan contains social groups for shared interests such as hunting, craftmaking, etc. However, Lo'ak picks up and enjoys diving while staying with the Metkayina. The Visual Dictionary even mentions that Lo'ak's ocean skillset is superior than Neteyam's, which delights Lo'ak to his surprise. However, this should not necessarily be confused as being a natural talent since Lo'ak is seen practicing with Tsireya, and it could be viewed that Lo'ak's progress is the result of hard-earned training. Additionally, it is another way for Lo'ak to be closer to Payakan. Lo'ak is shown to be very brave and won't hesitate to defy powerful or authoritative figures to do what his heart feels is right. He secretly joined his sister Kiri into sneaking into Hell's Gate to retrieve Spider, attempted to join the frontlines against the RDA, punched Aonung for insulting Kiri and his family, and tried to defend Payakan even when the whole Metkayina clan viewed him as an outcast that deserves alienation. He is shown to be outspoken at times, examples being when he gave Quaritch the double finger and when he attempted to challenge Tonowari's claims about Payakan, showing that Lo'ak doesn't just blindly believe what others tell him.