He is an assertive skipper, always looking to be proactive. His players are confident, all having had more than one innings or bowling performance of note in the course of the preparatory games.
The side to play England is unchanged from the first two games, and therefore, there is self-belief in the group.
New Zealand have done most things right thus far.
They won six of their eight completed ODIs leading up to the cup, and they have a groundswell of support. They are sought after by photo snappers when they arrive at airports. Just like 1992, when New Zealand on a wave of emotion made the semifinals, they will be feeling the love.
New Zealand have batsmen in good nick, including McCullum, key man Kane Williamson and Corey Anderson. Wicketkeeper Luke Ronchi provides vibrant hitting late on.
Trent Boult and Tim Southee have the new ball on a string, and Dan Vettori, fully recovered from a lengthy injury break, looks in good trim and bowling as demandingly as ever.
New Zealand's form line is as a frequent top-four finisher. Six times they've made the semifinals, but have yet to take the next step.
On form, and with momentum, this shapes as their best opportunity to make the final. From there, the old wisdom is that teams must lose a final before they know how to win one.
The big challenge could be winning three successive games against top opposition, bringing varied games and game plans.
McCullum, scorer of New Zealand's first triple century last summer and Halberg Sportsman of the Year, could be the man to take his side further than ever before.
New Zealand
ODI ranking:
5
World Cup record
1975: Semifinals
1979: Semifinals
1983: First round
1987: First round
1992: Semifinals
1996: Quarter-finals
1999: Semifinals
2003: Second stage
2007: Semifinals
2011: Semifinals
Captain:
Brendon McCullum
Stars:
Swing bowler Trent Boult, batsman Kane Williamson and allrounder Corey Anderson.
Watch out for:
McCullum at the top of the order. Can change a game in 10 overs of explosive batting.
Strengths:
Batting depth, dangerous new ball bowling and will field as well as any team in the cup.
Weaknesses:
None immediately obvious but the middle order might just be fragile if things start to go wrong.
Nemesis:
Sri Lanka have beaten New Zealand in the semifinals at the last two cups. Pakistan have done likewise, in 1992 and 1999.
Squad:
Brendon McCullum (c), Martin Guptill, Kane Williamson, Ross Taylor, Grant Elliott, Tom Latham, Corey Anderson, Luke Ronchi, Dan Vettori, Nathan McCullum, Tim Southee, Kyle Mills, Mitchell McClenaghan, Adam Milne, Trent Boult.