The New Fathers for Justice campaigners dressed as superheroes, including Spiderman and Batman, for their demonstrations in Oxford and Witney.The group began protesting at Oxford Combined Court Centre at about 8am.
At least one protester tried unsuccessfully to scale the side of the St Aldate’s building.
The campaigners later gathered outside David Cameron’s office in Witney at about 2pm.
They brandished an effigy of Gordon Brown, but were prevented from burning the ‘guy’ by police.
Roger Crawford, 61, who dressed as a jester, said: “We've dressed as superheroes because all dads are superheroes.
“It also brings an air of levity to a serious topic — we don't want to alienate anyone.
“Wherever we go, the response is always supportive.“ Jason Sands, 36, said: “We are trying to get a message across to David Cameron that we want him to support us.
“This Labour Government has done nothing to help us.
“Fathers for Justice has got smaller.
“But we want to let Mr Cameron know that it’s still here, and a lot of people are going through it badly.”