Answer the question at the end by quoting:

Leonardo, nicknamed Leo, is a fictional character and one of the four main characters in Teenage Mutant Ninja Turtles comics and all related media. He is often depicted wearing a blue eye mask. His signature weapons are two katanas. Leonardo is the most serious, the most spiritual, the most disciplined, and the most in-line with Splinter's teachings and thoughts, and is the leader of the Turtles.
In Teenage Mutant Ninja Turtles, Leonardo was fairly modest and sensitive, rarely issuing direct commands and seemingly much more relaxed around his brothers thinking of himself as more of an equal than a leader. It was he who first communicated telepathically with a kidnapped Splinter and seems the most anxious about Raphael's health after his ambush by the Foot Clan. He fought alongside his brothers against The Shredder in the climatic battle and was the only one of the four to actually injure The Shredder, but, like his brothers, could not defeat him. Due to the focus on Raphael in the film's plot, Leonardo's personality was rarely explored and his leader position in the team took a back seat. Leonardo was portrayed by David Forman and voiced by Brian Tochi. In The Secret of the Ooze, Leonardo was much more prominent and his leader position was brought to focus. He is seen on many occasions bickering with Raphael as their sibling rivalry begins to become much more serious. He, like his brothers, was astonished at the return of the Foot but he found that their current homelessness due to their last battle was a more pressing issue and soon he convinced his brothers that they needed to move. Leonardo is once again sensitive, caring, and humorous in this adaption but he now appears much more bossy and controlling. In Teenage Mutant Ninja Turtles III, after traveling back in time to feudal Japan, Leonardo leads his brothers to help a village in trouble from the villainous weapons trader, Walker, and to return home.

why did he and his brothers fight shredder?

Answer the question at the end by quoting:

Thomas Jacob "Tommy" Hilfiger (born March 24, 1951) is an American fashion designer best known for founding the lifestyle brand Tommy Hilfiger Corporation in 1985. After starting his career by co-founding a chain of record stores in upstate New York in the 1970s, he began designing preppy sportswear for his own eponymous menswear line in the 1980s. The company later expanded into women's clothing and various luxury items such as perfumes, and went public in 1992. In 1997, Hilfiger published his first book, titled All American: A Style Book, and he has written several since, including Tommy Hilfiger through Assouline in 2010.
In 1995 Hilfiger launched The Tommy Hilfiger Corporate Foundation. With an emphasis on health, educational and cultural programs, the organization supports charities that focus on at-risk American youth. In 1998 Hilfiger was one of several sponsors along with Moet and Chandon, Christie's Auction House, and The Advocate of the charity LIFEbeat - The Music Industry Fights AIDS. He is also personally involved in charities and causes such as Autism Speaks and the MLK, Jr. National Memorial Project Foundation, and he has served on the board of directors for The Fresh Air Fund, a New York-based group that helps underprivileged children attend summer camp. The Fresh Air Fund's Camp Pioneer program was renamed Camp Tommy in 1999, in honor of Hilfiger's patronage. Since 2008, Hilfiger has designed limited-edition handbags in support Breast Health International (BHI), an international organization focused on finding a cure for breast cancer. A portion of the handbag sales proceeds are donated to BHI's Fund For Living program, with celebrity ambassadors appointed for each seasonal campaign. In 2013, Claudia Schiffer and Naomi Campbell modeled the BHI bag in a photo shoot with photographer Patrick Demarchelier. Millennium Promise, a non-profit organization focused on eradicating extreme poverty, hunger and preventable disease in impoverished regions, classifies Hilfiger as a Millennium Promise MDG Global Leader, and in 2009 Hilfiger made a five-year $2 million commitment to Millennium Promise. The donation went towards relief efforts in a Ugandan city, with the aim of improving residents' access to necessities like clean water, education, and farming techniques. In 2012, all philanthropic activities of The Tommy Hilfiger Corporate Foundation were renamed Tommy Cares, a wider-reaching global initiative that further integrates the brand's non-profit partnerships, charitable contributions, and employee involvement. On a global scale, Tommy Cares continues to support organizations such as Save the Children, the World Wildlife Fund, War Child, and Millennium Promise. Hilfiger and his wife are on the board of Autism Speaks as of 2012, and through the organization, Hilfiger became a sponsor of the Golden Door Film Festival in September 2014.

What other events did they hold?
He is also personally involved in charities and causes such as Autism Speaks and the MLK, Jr. National Memorial Project Foundation,