DD (2.6) has been going on about this Aggie (I'm not sure of the correct spelling!) for some time now. She'll say things like "I'm going to make some beans and strawberries for Aggie. I think Aggie will love them! I asked her what Aggie looked like the other day and apparently HE wears a brown raincoat and a 'treat hat' that's covered in grapes and he lets you pick them off and eat them. (DD clearly likes her fruit & veg!)
I didn't have an imaginary friend when I was a kid so this is totally new to me - should I be going along with it/encouraging it?
If your DCs have imaginary friends, how far do you play along?
(I should add she's got loads of lovely real friends too and is a very sociable little thing.)