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Hank is an octopus. Actually, he’s a ‘septopus’: he lost a tentacle — along with his sense of humor — somewhere along the way. But Hank is just as competent as his eight-armed peers. An accomplished escape artist with camouflaging capabilities to boot, Hank is the first to greet Dory when she finds herself in the Marine Life Institute. But make no mistake: he’s not looking for a friend. Hank is after one thing — a ticket on a transport truck to a cozy Cleveland facility where he’ll be able to enjoy a peaceful life of solitude."
Hank first appears in the film in Dory's tank room in the Marine Life Institute, planning to escape into Quarantine so he can live a life of solitude in Cleaveland. To do so, all he needs is a tag, which Dory has. He decides to help Dory find her family as long as she gives her tag in return.
Hank takes her through the building, but Dory's clumsiness causes her to fall into a bucket of fish food for Destiny, who tells her she's from the Open Ocean exhibit. Dory decides not to go through the pipes and with Hank, as she thinks she'll get herself lost without company.
Dory and Hank use a baby stroller to find the Open Ocean Exhibit, but Dory's interest in glasses causes them to fall into a touching tank, where Hank shows his fear of being touched. Dory calms him down by telling him to keep swimming, only for him to release ink upon being poked, scaring all the kids away.
Source: Disney.wikia.com