The entertainer performed stand-up sets at prestigious venues including the London Palladium, and appeared on TV programmes such as Wogan and The Bob Monkhouse Show.
Lawyer Thomas Giuffra, who is representing the men, said the way Combs allegedly went after them was "very consistent". His legal team argues the complaints are "full of lies".
The 32-year-old singer and actress posted a collection of pictures on Instagram showing her wearing an engagement ring and Blanco, 36, kissing the side of her head.
The 62-year-old star teased his retirement in 2022, saying he would only take another role "if the angels bring some sort of script that's written in gold ink".
Nemo, the Swiss entrant, was crowned the winner of the 2024 Eurovision Song Contest, held in Malmo, Sweden, earlier this year - but said the experience had been "intense" and they were "really sad" it had not just been "all about love and unity".