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Eric Harris played a lot of DOOM in his free-time, but that is already a well-known fact. I forgot his other hobbies though.

DF978 wrote:

Eric Harris played a lot of DOOM in his free-time, but that is already a well-known fact. I forgot his other hobbies though.

He also practised shooting with Dylan

Dylan Klebold loved to watch baseball and was into baseball fantasy but this is also a well known fact

According to Luis de Castro's father, he was very fond of soccer.  According to his father, he and Guilherme spent hours under a tree talking about soccer.  Guilherme Taucci seemed to like Creppypastas, especially Jeff the Killer and the game Five nights at Freddys.

Vladislav Roslyakov enjoyed shooting and playing Minecraft
Devon Erickson sang and listened to music
William Atchison enjoyed going on internet forums

Also Adam Lanza, playing games

Tim Kretschmer really loved playing table-tennis and wanted to become a professional player. But obviously, he didn't.

Gabriel Wortman enjoyed collecting decomissioned RCMP patrol cars and memorabilia like uniforms, et cetera. This later worked in his favor in his rampage unfortunately.

Eric and Dylan were obviously both into writing and video/computer games (they would have loved Halo!) They were both into filmmaking and Eric was into web design.

Terry Ratzmanns hobbies were raising trout in his basement and periodically eating them for dinner. He also loved gardening including venus flytraps.

Adam Lanza loved Dance Dance Revolution, anime music and researching murder. He would have really leaned into Tumblr TCC blog culture had he not snapped.

"Andrew Blaze" enjoyed making films and animations and researching Columbine. He particularly idolized and maybe even romantically obsessed on Eric Harris.

Timothy McVeigh drove around the country to various right wing gun rights protests, particularly in Waco Texas during the government siege of the Branch Davidian cult there. His later OKC bombing was in direct revenge for Waco or so he claimed. Also for Ruby Ridge.

Jeff Weise enjoyed making crude web animation shorts and talking proudly about how he was a Native Nazi (Native American). He loved movies like Zero Day and Elephant which were basically brand new at the time. Columbine itself was not that long ago for Weise and he was obsessed with that as well. Terrible upbringing. Sad but no excuse. But i digress.

Anton Lundin Pettersson played games like SWTOR (Star Wars The Old Republic)

Elliot Rodger watched anime.

Randy stair liked drawing, I think that if he had been more motivated and would practiced he would have had good results.

Morné Harmse (2008 Nic Diederichs Technical High School sword attack):
Martial arts
Making swords and ninja paraphernalia
Reading about mind control, the occult, and mental disorders
Researching topics related to bombs and guns

Brenda Spencer (1979 Cleveland Elementary School shooting):
Shooting her rifle, sometimes with her dad or friends

Kip kinkel plays basketball in prison.
Rafael Juniors liked to listen to music
Anders breivik playing games and watch movies

Anthony "T.J." Solomon (1999 Heritage High School shooting):
Hunting
Target shooting
Fishing
Golf
Listening to music inside on the computer
Camping with family
Boy Scouts
Baseball
Writing rap lyrics
(Source.)

Alvaro Castillo

Watch movies and television
Research on columbine
Cleaning

Robert Poulin: Collecting porn

Barry Loukaitis: Student council (in years before attack)
Watching movies (especially Natural Born Killers)

Marc Lepine: Computer games

Anton Lundin Pettersson: World of Warcraft, Skyrim, and Might and Magic

Ilnaz Galyaviev enjoyed playing CS:GO and got the money to buy his gun through selling weapon skins for the game.

Mitchell Johnson:
School sports (football, baseball, and basketball teams)
Sang in a church choir that performed for the elderly

Andrew Golden:
Played trumpet in the school band
Raced go-karts
Played baseball

Robert Poulin in a unsent letter he described his hobbies as in order of favorites
> War gaming
> reading ( Science fiction)
> collecting ( A variety of things including stamps and models)

Nathaniel Berhow:
Hunting
Track and field
Boy Scouts (at least when he was younger)

Anthony Barbaro:
Target shooting on school's rifle team
Chess

Michael Andrew Clark:
Played saxophone

Matti Saari enjoyed playing the drums, and uploaded Youtube videos of him doing so to another channel he had.

Michael Slobodian:
Drums and guitar in school band
Hunting, often with his father

Pekka-Eric Auvinen:
Making videos
Target shooting

Luiz Henrique de castro: he like to go to the cybercoffe and play with Guilherme.  There they used to play "Counter Strike"  on PC and in a other XBOX store they like to play "Mortal Kombat" and "Call of Dutty"

Hayden Jagst (attempted mass killer):
"Playing guitar
Watching anime
Listening to music"
(Source.)
Reading manga
Making memes on Youtube
Using reddit and forums

Hayden Jagst
"Surfing the internet, researching mass murder, discovering new music"

Pekka Eric Auvinen - Enjoyed outdoor hobbies such as walks and bike rides but eventually replaced those eventually with spending time at his computer reading books listing to music and watching movies.

Kip kinkel: reading poetry  (in jail)
meditation (in jail too)

Jaylen Fryberg: Basketball (if his twitter contents are any indication)
Никита Лыткин (Nikita Lytkin): Music (punk band and noisecore band,) drawing, kickboxing, social networks / the internet, computer games, and church (but only as a child.)
Артём Ануфриев (Artyom Anoufriev): Guitar and double bass, sang and played in a local musical group, social networks / the internet, and played in a punk and noisecore band with Lytkin.

More of Rafael junior: Drawing, writing phrases / legends   ...

Elliot Rodger enjoyed going on car rides through Isla Vista,California while listening to music on the radio,while lamenting his frustrations toward society,women,and the state of his life.

Ilnaz Galyaviev:
- Reading
- Playing CS:GO

Jared Lee Loughner - Conspiracy Theories and posting on conspiracy theory forums

Brenton Tarrant, Anders Breivik, George Sodini, and Seung Hui Cho exercised at the gym.
(The former two took steriods and lost most of their musculature in prison. Cho's autopsy noted a "distinct lack" of muscles. Sodini said it helped to dispel his frustration to the degree he had to make a motivational list to keep up planning for his attack.)
Sodini also googled for hours, saying it was better than TV.

dyonqqr wrote:

Brenton Tarrant, Anders Breivik, George Sodini, and Seung Hui Cho exercised at the gym.
(The former two took steriods and lost most of their musculature in prison. Cho's autopsy noted a "distinct lack" of muscles. Sodini said it helped to dispel his frustration to the degree he had to make a motivational list to keep up planning for his attack.)
Sodini also googled for hours, saying it was better than TV.

I’m gonna have to agree with Sodini there.

Employer_Square wrote:

I’m gonna have to agree with Sodini there.

I very nearly wrote the same thing myself, almost word for word.
Michael Andrew Clark also "tinkered with boats and autos."

Jesse Osborne: Studying history (World War II, the Civil War, etc.)
Shooting airsoft guns (he also mentioned having shot every gun in the house.)
Spending time with pets (he described his rabbit as his best friend, and spent time with every pet before leaving for his attack.)
Engaging in school shooter / true crime communties online (Skype, Instagram, etc.)

John Timothy Earnest: Playing piano

Pekka Eric Auvinen - Making Youtube videos, Researching political ideologies, Shooting

Bastian Bosse - Shooting airsoft guns

Adam Lanza - Playing DDR

William Atchison: Making youtube videos

Anders Breivik listed his sports hobbies as "snowboarding, fitness, bodybuilding, spinning, running."

dyonqqr wrote:

Anders Breivik listed his sports hobbies as "snowboarding, fitness, bodybuilding, spinning, running."

Spinning?

Employer_Square wrote:

Spinning?

Your guess is as good as mine. Maybe it was an awkward translation to English (despite Breivik's normally perfect english?) or an attempt at a lighter mood. Either way, this soon-to-be terrorist just spinning for fun is an image I choose to take literally.

dyonqqr wrote:

Employer_Square wrote:

Spinning?

Your guess is as good as mine. Maybe it was an awkward translation to English (despite Breivik's normally perfect english?) or an attempt at a lighter mood. Either way, this soon-to-be terrorist just spinning for fun is an image I choose to take literally.

Yeah I guess we’ll never know lol.I’m imagining him doing it with all his gear on lmao.

Charles Andrew Williams: Class play, sports, acting as class president
Shinji Aoba: Making visual novels
Cheng Chieh: playing violent online games, writing horror stories, blogging (often about murder.)

Randy stair: -Playing guitar, piano and sing.

Randy Stair - Making Youtube videos, animating, watching cartoons (particularly Danny Phantom and MLP)

Adam Lanza played the saxophone.

Guilherme taucci- Drawing,  researching mass murders, making edits for youtube

Petri gerdt- making bombs, playing basketball

Martin Peyerl - Playing Video games

David Katz - Playing videogames, especially Madden

Luke Woodham: DnD, if I recall correctly
Ian David Long: Making EDM, watching the news, smoking weed, walking his dogs, going to bars (which he mostly stopped some time before the shooting,) using his phone
Alex Hribal: Reading, researching Columbine, watching anime