Biden has been accused of inappropriate contact with women at public events, such as embracing, kissing, gripping, or placing a hand on their shoulder. He has described himself as a "tactile politician" and admitted this behavior has caused trouble for him in the past.

In March 2019, former Nevada assemblywoman Lucy Flores alleged that Biden had touched her without her consent at a 2014 campaign rally in Las Vegas. In an op-ed, Flores wrote that Biden had walked up behind her, put his hands on her shoulders, smelled her hair, and kissed the back of her head, adding that the way he touched her was "an intimate way reserved for close friends, family, or romantic partners—and I felt powerless to do anything about it."
Two days later, Amy Lappos, a former congressional aide to Jim Himes, said Biden touched her in a non-sexual but inappropriate way by holding her head to rub noses with her at a political fundraiser in Greenwich in 2009. The next day, two more women came forward with allegations of inappropriate conduct. Caitlin Caruso said Biden placed his hand on her thigh, and D.J. Hill said he ran his hand from her shoulder down her back.
In early April 2019, three women told The Washington Post Biden had touched them in ways that made them feel uncomfortable.
In April 2019, former Biden staffer Tara Reade said she had felt uncomfortable on several occasions when Biden touched her on her shoulder and neck during her employment in his Senate office in 1993.

Biden apologized for not understanding how people would react to his actions, but said his intentions were honorable. He went on to say he was not sorry for anything he had ever done, which led critics to accuse him of sending a mixed message.

In March 2020, Reade accused him of a 1993 sexual assault. Biden and his campaign denied the allegation.

In mid-2007, Biden stressed his foreign policy expertise compared to Obama's, saying of the latter, "I think he can be ready, but right now I don't believe he is. The presidency is not something that lends itself to on-the-job training." Biden also said Obama was copying some of his foreign policy ideas.

During his years as a senator, Biden acquired a reputation for "putting his foot in his mouth".
In public appearances, he is known to deviate from prepared remarks.
The New York Times wrote that Biden's "weak filters make him capable of blurting out pretty much anything"

In 1988, Biden suffered two brain aneurysms, one on the right side and one on the left. Each required surgery with high risk of long-term impact on brain functionality. In February 1988, Biden was taken by long-distance ambulance to Walter Reed Army Medical Center and given lifesaving surgery to correct an intracranial berry aneurysm that had begun leaking

Another operation to repair a second aneurysm, which had caused no symptoms but was at risk of bursting, was performed in May 1988. In 2013, Biden said, "they take a saw and they cut your head off", and "they literally had to take the top of my head off." He also said he was told he would have less than a 50% chance of full recovery.

In the mid-1970s, Biden was one of the Senate's leading opponents of race-integration busing. His Delaware constituents strongly opposed it, and such opposition nationwide later led his party to mostly abandon school integration policies

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Jean (mother) was of Irish descent, with roots variously attributed to County Louth[12] and County Londonderry.
Joseph Sr.'s (father) parents, Mary Elizabeth (née Robinette) and Joseph H. Biden, an oil businessman from Baltimore, Maryland, were of English, French, and Irish descent.