Mr Brenton, a suspected white supremacist, was pictured handcuffed in the dock wearing a white prison shirt, and stood in silence without entering a plea and will be remanded in custody until April 5.
The Crusaders are the defending champions in Super Rugby, a competition that involves teams from New Zealand, Australia, South Africa, Japan and Argentina.
"It is clear that this can now only be described as a terrorist attack", Prime Minister Jacinda Ardern said, noting that numerous victims could be migrants or refugees.
A heavy police presence was seen, as 28-year-old Brenton Tarrant faced a Christchurch district judge Friday.
New Zealand will ban semi-automatic rifles, Attorney-General David Parker said on Saturday and was greeted loudly by a crowd here on vigil after the horrific killing of 49 people in Christchurch shootings.
At least 48 people were wounded, some critically.
Two people are still in custody.
They said they were saddened by the "senseless" attacks.
The court charged a second shooter, 18, with "intent to excite hostility or ill-will". Tarrant has spent little time in Australia in the past four years and only had minor traffic infractions on his record.
"We cut the silver fern out of our garden just to let all our Muslim community know that our hearts are breaking for them today and we stand with them in solidarity", Wendy Johnson told the StuffNZ website.
Two improvised explosive devices (IEDs) were found in a auto and neutralised by the military, while police raided a home in the southern city of Dunedin, where Ms Ardern said the suspect was based. But it has one of the lowest gun homicide rates in the world. In 2015, it had just eight gun homicides.
Bush said it took 36 minutes from the first attack to the suspect's arrest.
Five guns were used in the attack including two semi-automatic weapons and two shotguns.
Kim Kardashian applauded New Zealand's lawmakers for proposing to change the country's gun laws following the mosque shootings that left at least 49 people dead. "If they are not of our people, but live in our lands, they must be removed".
"The offender was mobile, there were two other firearms in the vehicle the offender was in", Ardern said. I think it's a small group of people that have very, very serious problems, I guess. The shock was exacerbated by the fact Tarrant livestreamed his actions from a camera mounted to his helmet, sparking anger at social media platforms and the length of time it took them to remove the videos.
In the video, the killer spends more than two minutes inside the mosque spraying terrified worshippers with gunfire.
"He always seemed to embody the philosophies of the fitness industry which is that we are inclusive and we accept all shapes of sizes and all fitness abilities and we are here to help and improve and help people", she said.
After going back outside and shooting a woman there, he gets back in his auto, where a song can be heard blasting.
I have spoken this evening to the mayor of Christchurch and I intend to speak this evening to the Imam.
Tarrant's sickening film showed casualties crawling across the bloody floor of the Al Noor mosque as the terror suspect unloaded rounds into them.
Naeem migrated to New Zealand with his family in 2009 and was a teacher. All the weapons were legally obtained.
Ardern further differentiated herself from Trump's conduct following attacks on minority communities when she was asked whether she agreed with the president's assessment, shared on Friday, that white supremacy is not a growing global problem.
"There is a dimming of enlightenment in many parts of the world", Parker said.