Sam Neill’s friends, peers and admirers have rushed to pay tribute to the actor, after his sudden death on Monday at the age of 78.

Neill’s co-star in A Long Way Down and Aussie crime caper Dirty Deeds, Toni Collette, called him a “hero,” “legend” and a “sweetheart”. She wrote: “Our great friend. You are already missed so very much. Continue in peace wherever you are.”

Australian director Phillip Noyce, who directed Neill in the 1989 thriller Dead Calm alongside Nicole Kidman, told the Guardian: “Sam was perhaps the most gentlemanly actor ​I ever encountered. Level-headed and sincere in a show business world of crazy egos. His word was his contract.”

“​In a strange way Sam was responsible for my long career in Hollywood. When there were rumours that George Miller might have secretly directed Dead Calm, Sam assured the American producer​, Mace Neufeld​, that I was indeed the director –​ and Mace then signed me to direct Harrison Ford in Patriot Games,” Noyce added.

Jurassic World Dominion director Colin Trevorrow, called Neill a “deeply soulful and beautiful man” who’d supported him during challenging times. “I’ll remember him for his tranquility, his love of wine, and for the calm assuredness he brought to his characters,” he added.

Richard E Grant, a friend of Neill’s for more than three decades who starred alongside him in 2019’s Palm Beach, called him “an officer and a gentleman in the truest sense. Guided and helped me through a very difficult time in my life”.

Alan Cumming called him “a glorious beautiful man”, while Kylie Minogue wrote: “Vale Sam 💔,” a Latin term for farewell or goodbye used in Australia.

Universal Pictures wrote: “Rest in peace to our Jurassic legend, Sam Neill,” on X.

Actor Magda Szubanski, a friend who Neill once named one of his ducks after, said she was “absolutely shocked” by his death.

“When I spoke to him not long ago, he was cancer-free and really happy and excited about life, so this is just devastating,” she said. “He was just a one-off. Just such a talented, classy, beautiful, wry, warm human being.”

Actor David Wenham said that “aside from being an international all-round legend”, Neill was “the kindest, cheekiest, most generous and supportive friend going around”.

The Australian journalist Laura Tingle, with whom Neill had a relationship, posted pictures of them together on Instagram and wrote: “Sweet Dreams darling Sam.”

The New Zealand prime minister, Christopher Luxon, said Neill was one of the greats.

“He started out when there was barely a film industry in this country to speak of,” Luxon said in a social media post. “For more than 50 years he took New Zealand stories to the world and his talents helped make our film industry into what it is today – one of our greatest cultural exports. His work will be watched and loved long after all of us.”

Australian prime minister Anthony Albanese paid tribute to the actor, writing on X: “Sam Neill starred in so many beloved Australian stories and he earned a special place in Australian hearts. Wry and dry, thoughtful and laconic, Sam fought illness with the same dignity, humour and conviction that gave strength to his every performance. He will be much mourned and long remembered. May he rest in peace.”

Novelist Kathy Lette said Neill’s unexpected death was heartbreaking: “Sam was not just a wonderful actor but also the most charming, kind, intelligent and deliciously self-deprecating friend. His wry, dry humour and mischievous twinkle lit up our lives.”

Fijian New Zealand director Toa Fraser, whose film Dean Spanley starred Neill as the titular character, said: “Sam championed me and so many of us right from the start. He changed my life, by his example and his actions … it’s one of my big regrets that when he came to me on the set of Dean Spanley (more than once) and said, ‘Do you want to come for dinner,’ I declined. I had homework to do.

“Well I will be raising a glass of Hungarian Tokay this evening to him, and probably a glass of Pinot in the Burgundian tradition to him and his mentor James Mason too.”

New Zealand film producer, Chelsea Winstanley remembered Neill as “a wonderful human, fighting to the end, for the whenua [land], for the screen”.

“Ngā mihi [thank you] Sam for all you gave to the screen industry, you will be missed. Your fight to save the whenua [land] from extraction and exploitation will carry on … What a time you all had shaping the industry we love, thank you.”

New Zealand actor Joel Tobeck, who starred alongside Neill in the 2003 film Perfect Strangers, wrote on Instagram: “This man made me feel like I could fly. Even when I was all over the place in his presence he made it OK. We loved to talk rugby. RIP my old mate. Sam Neill, a true gentleman.”

Rhys Darby, fellow Kiwi and star of HBO’s Flight of the Conchords, wrote: “A truly great human, a legend and an inspiration to all even beyond the art world. We will always love you Sam.”

New Zealand actor Karl Urban paid tribute, calling Neill an inspiration for many who followed in his trailblazing footsteps. “A beautiful man, a national treasure who gave so much to New Zealand and the to world. God speed, Sam.”

Outside his acting work, Neill was a passionate environmentalist who campaigned for various causes including marine conservation and against mining proposals in New Zealand. After his death, New Zealand’s department of conservation called Neill “a legendary Kiwi” and “a fierce and passionate champion for our environment”.

“Whether it was advocating for our native species, supporting local conservation projects, or simply sharing his deep love for our unique landscapes, Sam walked the talk. He understood that our nature isn’t just something to look at, it’s something we must cherish and protect. His warmth, wit, and unwavering voice for the wild will be deeply missed.”