You can describe someone as a prodigal son or daughter if they leave their family or friends, often after a period of behaving badly, and then return at a later time as a better person. Prodigal is also a noun. the prodigal had returned
{i} extravagant person, lavish spender; spendthrift, squanderer, one who wastes money
a recklessly extravagant consumer marked by rash extravagance; "led a prodigal life
Given to extravagant expenditure; expending money or other things without necessity; recklessly or viciously profuse; lavish; wasteful; not frugal or economical; as, a prodigal man; the prodigal son; prodigal giving; prodigal expenses
very generous; "distributed gifts with a lavish hand"; "the critics were lavish in their praise"; "a munificent gift"; "his father gave him a half-dollar and his mother a quarter and he thought them munificent"; "prodigal praise"; "unsparing generosity"; "his unstinted devotion"; "called for unstinting aid to Britain"
Someone who behaves in a prodigal way spends a lot of money carelessly without thinking about what will happen when they have none left. Prodigal habits die hard. someone who spends money carelessly and wastes their time - used humorously
One who expends money extravagantly, viciously, or without necessity; one that is profuse or lavish in any expenditure; a waster; a spendthrift