Manager Gary Speed wants Wales to show their "horrible" side as they bid to rise from 117th in the world rankings.
They face Montenegro on Friday in Cardiff, then England at Wembley on Tuesday in the 2012 European Championship qualifiers.
Speed's squad includes Premier League stars Gareth Bale and Aaron Ramsey.
"If anything I want them to be more confident, more arrogant and more horrible and get that winning mentality," said Speed.
"Sometimes they are too nice, I seem to recall someone saying they are all perfect son-in-laws.
"They are young guys and are making their way in the game, we have a couple of characters in there and hopefully they come to the fore and drive people on."
Wales' Euro 2012 campaign is already futile following a string of disappointing results th at included a 2-0 defeat by England at the Millennium Stadium in March.
Speed has since come in for some criticism over the tactics his side employ, but he says he will not allow that to affect his approach based on a quick, passing style of play ahead 2014 World Cup qualifying that starts in 2012.
He added: "I think their application has been fantastic in terms of what we've asked them to do," Speed said.
"If you look at the England game in March, we went 2-0 down early on but we stuck to our game plan.
"I don't listen to people who criticise us from game to game, I have a long-term strategy I believe in.
"Welsh football is at a low ebb but look at the players we have.
"I have played with some great players for Wales but none with the potential we have got in there, and that gives me the confidence we can do it.
"We are gradually changing things round, it takes time.
"Maybe some of the results could have been better with a different approach, but we want to cement a style that makes us successful in the future, and that was my main goal when I took the job.
"The players we have got now are all good players and we need to maximise their potential, and hopefully tomorrow can be the start of getting people to believe in us.
"We are trying to do something special, which is what it will take for us to qualify. It can't be done overnight."
Wales now face Group G's two pace-setters, with both Montenegro and England unbeaten on 11 points.
They hope to do so with Jack Collison available after the midfielder trained following his recovery from a stomach bug, raising hopes that he will make his first start for Wales in a competetive match.
Wales squad to face Montenegro and England:
Goalkeepers: Wayne Hennessey (Wolverhampton Wanderers), Boaz Myhill (West Bromwich Albion - Loan Birmingham City)
Defenders: Darcy Blake (Cardiff City), Danny Collins (Stoke City), James Collins (Aston Villa), Danny Gabbidon (Queens Park Rangers), Chris Gunter (Nottingham Forest), Adam Matthews (Celtic), Neil Taylor (Swansea City), Ashley Williams (Swansea City)
Midfielders: Joe Allen (Swansea City), Gareth Bale (Tottenham Hotspur), Jack Collison (West Ham United), Andrew Crofts (Norwich City), Andy King (Leicester City), Joe Ledley (Celtic), Aaron Ramsey (Arsenal), Hal Robson-Kanu (Reading), David Vaughan (Sunderland)
Strikers: Craig Bellamy (Liverpool), Simon Church (Reading), Robert Earnshaw (Cardiff City), Steve Morison (Norwich City), Sam Vokes (Wolverhampton Wanderers)
Standby: Lewis Price (Crystal Palace), Lewin Nyatanga (Bristol City), Ashley Richards (Swansea City), Rhoys Wiggins (Charlton Athletic), David Cotterill (Swansea City), David Edwards (Wolverhampton Wanderers), Jermaine Easter (Crystal Palace), Ched Evans (Sheffield United)