Whisper is a fairly quiet person, and tends to keep to himself most of   the time. Whisper tends to talks very quietly out of habit.
 He's  very laid back and understanding, and he loves to help people. He loves  to make people smile and so he tends to  crack jokes here and there,  some tend to fall into the line of Dad Jokes, he seems to find that the  funniest part. He tends to accidentally act like a dad sometimes without  realizing it. When comforting people, he tries to be there for them,  but is kinda bad with words, so he just offers to let them vent to him.  Whisper is also bad at comforting because if he sees someone crying  he'll probably start crying, hes a sensitive little baby.
If he  notices someone's upset, sometimes he'll drop by their room and drop in  something they like right inside of their door, and then leave without  saying anything further.
He also tends to tease people a lot, but in a  very fun, harmless way. He likes to joke about people liking each  other, and if two people are close hes bound to make some sort of joke  about them having crushes on each other.
Whisper also tends  push  himself a little too hard, most of the time ends up getting himself   hurt. He has a fear of being seen as a failure, so he tries to help  everyone he can. He tends to get a little upset when people tell him to  take a break or take care of himself better, mostly because he doesn't  know how to.

Pre-war

Whisper was born in England and lived there for most of his life. His   mother was British and his father was Irish. Whisper was an only  child.  Whisper's birth name is Ethan Bissett.
Whisper grew up  to become an engineer and did it up until the bombs came down. Whisper  was mainly skilled in technology and electricity.
When  Whisper was  about 20, his mother passed away, and so he was left growing up with his  dad. For almost Whisper's entire life, he never came out to his dad,  because he knew he would react badly.
When Whisper was about 27, he  moved out of his dad's house, and ended up falling in love with a man at  his job, they dated for a few years, and when Whisper was 33, they got  married. When Whisper's father found out, he raged, and threw a whole  bunch of threats at him, and so Whisper and his husband packed their  things and moved to the Commonwealth.
Whisper and his husband moved into Sanctuary, where he became acquainted with his neighbor, Alan.

post-war

When the bombs fell and everyone was sent to Vault 111, Whisper's  husband didn't make it through the cryogenic slumber, and when Whisper  first  walked out of the vault, he broke down crying. Due to Whisper  being in so much despair, he started to take chems and started drinking,  and soon fell into the addiction.
Within the first few months  of being out in the commonwealth, he found out about the Railroad, and  decided to join them. There is where Whisper got his name, when they  asked what his name was, he told them that he didn't go by his birthname  anymore because it reminded him of his past and so they asked him what  he would like to be called, and that's when he started to go by the name  Whisper, named after one of his favorite songs.
About a few months  in the commonwealth, he was reunited with his neighbor Alan at the  Railroad, since Whisper was already a member. He heard about Alan's  problem and how his son is lost, and decided to help him look for him.  Whisper and Alan helped rebuild Sanctuary together.
One day when  Whisper was shopping at Bunker Hill, he was approached by Edward Deegan,  who was asking for help, to help with a problem him and  his boss had,  and Whisper brought along Alan to do it with him.
When Deegan  got hurt during the asylum raid, Alan had Whisper take him away while he  finished the job. Whisper went on the search for a safe place to keep  Deegan, and that's when he found the place he names "The Treehouse."
The  Treehouse was a hideout that was underground, the entrance looks like a  normal tree stump, thus where the name for it came  from.
When  Whisper first started moving his stuff into the hideout, it was just  one room and one bed, where Deegan stayed, Whisper slept on the floor or  on his chair. Whisper spent all of his time taking care of  Deegan, up  to where he would lose sleep.
Whisper's love for Deegan was instant,  for Whisper, it was love at first sight, and it was  obvious, Whisper  wasn't the best at lying about his feelings. Once about 6 or so months  passed, Deegan admitted to having feelings for Whisper, and Whisper  admitted to his.
Once Deegan fully healed, Whisper decided to  turn the hideout into a safe place for anyone who was discriminated  against in the commonwealth. He had Mel help him dig more space with  SONYA2, and soon after, Whisper started inviting members to The  Treehouse.

Deegan met Whisper when he hired him to help him with a job. Deegan started to fall in love with Whisper when he was hurt and Whisper took care of him. He was touched at how kind he was.

Whisper and Alan knew each other before the war. Whisper and Alan met again in The Railroad, and when he heard about Alan's problem, Whisper decided to help him, and accompanies him on his missions sometimes. They sometimes like to go to Nuka-World together.
Alan has the canon Sole Survivor storyline.

Vernie is the doctor of The Treehouse. Him and Whisper met once during Whisper's travels, and Whisper was hurt. He found Vernie's clinic in an old shed in the middle of nowhere and got patched up, Whisper then invited him to The Treehouse where he now stays.

Darryl is another member of The Treehouse. He fixes and customizes weapons, he's also fairly good with electronics. Whisper and Darryl met at Bunker Hill, where Darryl was offering to repair weapons for a few caps.

Nick helped Whisper with a few things, and in return Whisper did the same, and sometimes tags along in his investigations. Whisper vaguely sees Nick as a fatherly figure.

Deacon was one of the first people Whisper became friends with. They enjoy each others company and makes jokes with each other all the time. They like to make up really weird and wild lies together.

Whisper met Hancock in Goodneighbor. Whisper liked to help people around, and Hancock noticed. They're each others go-to smoking buddy.

Patrick grew up in a vault in Ireland, which happened to be the vault Whisper's uncle stayed at, so Patrick is related to him by a few generations. Patrick joined The Brotherhood and soon after took a vertibird to the Commonwealth. He ended up leaving The Brotherhood soon after.

Whisper met Roger via Darryl, who asked Whisper if he was welcome to stay, and Whisper agreed. Roger works as the Treehouse Janitor.

Whisper met Mel in The Third Rail and they immediately hit it off. Mel helped Whisper make The Treehouse.