Kraven the Hunter (Sergei Kravinoff) is a fictional character appearing in American comic books published by Marvel Comics. Debuting in The Amazing Spider-Man issue #15 (August 1964) as an adversary to the superhero Spider-Man, he has since endured as one of web-slinger's most common foes, and is part of the collective of adversaries that make up Spider-Man's rogues' gallery. However, the character has also been depicted as an antihero, and an ally of Squirrel Girl. In the comics, Kraven is a renowned big-game hunter who aims to kill Spider-Man to prove himself as the world's greatest hunter, but maintains a code of honor and justice, treating his adversaries as equals. He is also the half-brother of the Chameleon, and one of the founding members of the supervillain team, the Sinister Six.
Source: Wikipedia, "[en.wikipedia.org/wiki/Kraven_the_Hunter Kraven the Hunter]", available under the CC-BY-SA License.