Hello Lelu,
I only have five baptisms identifed for Elisha Cooper and Tryphena Lovell:
Elisha Cooper, son of Elisha and Tryphena Cooper ‘Gypsies’, baptised at Moreton in Marsh, Gloucestershire on 15th February 1795.
Finetta Cooper, daughter of Elisha and Tryphena Cooper ‘Travellers’ baptised at Littleton, Middlesex on 26th March 1797.
John Cooper, son of Elisha and Trofany Cooper, baptised at Old Windsor, Berkshire on 28th July 1799.
Thomas Cooper, son of Elisha and Trophenia Cooper, baptised at Old Windsor, Berkshire on 22nd November 1801.
Daniel Cooper, son of Lesher Cooper and Tryphena, born on 19th August, and baptised at Walthamstow, Essex on 13th September 1809.
But of course there must have been more as John Hoyland’s 1816 book “A Historical Survey of the Customs Habits & present State of the Gypsies” has Elisha as ‘Lussha Cooper’ wintering with his wife and ten children at Tottenham Court Road, earning his living as a rat catcher.
Solomon Cooper and Trinity Cooper are also identified as children to the couple from an 1815 settlement order at Boreham, Essex, when they are both described as children of Elisha Cooper ‘Rat Catcher’ . Solomon's son Dukie Cooper later travelled around with his younger cousin, Oliver, the only son of John 'Fighting Jack' Cooper, step dancing in pubs. Solomon's wife was a Kissy/Kesia White born at Oakenham, Berkshire.
The other three might also be identified. Joseph Cooper, was described as ‘brother of Gipsey Cooper, the prize fighter’ when he was fined for mistreating a donkey at Whitsuntide Fair, Blackheath, Kent in June 1833. Simeon Cooper and Elijah Cooper, were similarly described as ‘Celebrated characters, brothers of Gipsey Cooper’ when they were charged for vagrancy at Roxwell, Essex in Janaury 1834.
I think Kezia Cooper, the partner of Joseph Junnix is more likely a child of William Cooper, as she is camped with Uriah Cooper and his family on the 1851 census, but I'm open to be proved wrong on that. Joseph Junnix was an east end butcher, from French Huguenot stock.