Sharks are unique among the races for their special dietary need - that is, Sharks must consume a certain amount of raw Magninium monthly, or face malnourishment and eventual death. This unique requirement is partially due to the fact that Sharks do not generate their own black magic like the other races, and must replenish it by eating excess. Therefore, two Sharks cannot feed off each other, as neither is generating more Magninium and more is being lost with each feeding. They are the only race capable of consuming any type of Magninium without adverse effects, and this has shaped their interactions with other races quite a bit... as the most viable source of raw Magninium is consuming the blood of fellow living things.
As such, Sharks are very much loners when it comes to their fellow race members. They struggle to get along and prefer mingling with those of other races, especially Rhino and unicorns - the two races with the highest output of Magninium. Physically, they resemble Dolphins, and often tend to be mistaken for them - which only exacerbates their negative reputation, as other individuals assume the Sharks purposefully misled them. Most Sharks dislike the stereotype of a vicious carnivore, and will go out of their way to appear friendly or submissive in order to win favor.
In civilized Universes, Shark citizens typically are distributed a monthly ration of Magninium by the government, carefully measured out to ensure they do not require more from other sentient beings. Especially violent or sadistic Sharks can and will still hunt individuals, however, supplementing their diet with excess. In uncivilized Universes or areas of poverty, the government may be unable to provide these rations, and Sharks may have to hunt other sentient races or animals to restore their Magninium. (While plants also contain Magninium, the amount of live plant matter a Shark would have to consume to reach daily dietary needs is enormous).
This general stereotype has pushed Sharks into one of two distinct political groups in most Universes: those who wish to dispel the stereotype through pacifistic means, and those who violently embrace the concept of being a merciless bloodletter. Sharks do not make distinctions between their variants like Dolphins or Ants, rather making choices about friends and family by which of the two major political factions they fall into. Moderates are few and far between, but still exist in rare groups.
Pacifistic Sharks (also called New World Sharks) are stereotyped as lazy asskissers who suck up to the other races for table scraps. They tend to create petitions, lobby for positive Shark representation, and refuse to harm anything alive for fear of feeding into the violent stereotype. Cruel stereotypes may paint them as flower-crown-weaving idiots, but many are brilliant in their mastery of law and nonviolent solutions to problems. They are less common in Universes without some form of rationed Magninium, but still appear.
Violent Sharks (or Old World Sharks) are stereotyped as violent murderers who would kill at the drop of the hat. However, they do not indiscriminately kill - rather, they tend to consume the Magninium of animals (especially livestock). They tend to take more violent or rowdy approaches to problem-solving and tend to get in more bar fights than actual harming of other individuals. They have no qualms against using violence, especially citing the fact that the violence of some races - such as Ants - is celebrated and legally protected in many Universes.
It is not impossible for Sharks from either political group to be friends with those of the other, but it's seen as an oddity. Neutral Sharks are often pressured into choosing sides, and teenagers are often interrogated by extended family members about their political decisions.
As a side effect of this divide, Sharks tend to be incredibly politically active, almost to the degree of Dragenmires.