The former TV comic whose anti-establishment "non-party" won more votes than any other single party in Italy's deadlocked election has showed no early signs of wanting to negotiate for power.
Beppe Grillo's 5-Star Movement collected almost 8.7 million votes overall, a tally which only trailed the multi-group blocs of the centre-left and centre-right.
Commentators said all his adversaries underestimated the appeal of a grassroots movement that found particular favour with young jobless Italians and others weary with Prime Minister Mario Monti's internationally-endorsed austerity agenda.
Mr Grillo, who mixes fierce attacks on corruption with policies that range from clean energy to free internet, surged in the final weeks of the campaign as hundreds of thousands turned up at his outspoken rallies.
More top news
A cloudy afternoon for many areas across the UK. The winds also strong with gusts on western coasts of Scotland. Temperatures remain mild.
A girl was told she would never walk again after she fell into a scalding bath as a baby has taken her first steps - after a leg amputation.
Could changes to diet could prevent or even reverse diabetes and help the NHS cut some of the £10 billion annual spend on treatment?