When Jonathan was ten years old, Lonnie forced him to kill a rabbit, which left him distressed for days.
When Lonnie divorced Joyce, he made little effort to maintain healthy relationships with his sons. Joyce mentioned that "Lonnie used to say that Will was queer, called him a fag."
By 1982, Lonnie was living in Indianapolis. He began dating Cynthia.
When Will went missing, Joyce called Lonnie multiple times, not because she believed in the possibility of Will being with him, but because Chief Jim Hopper did. He never answered his phone, but his girlfriend did, and she hung up on Joyce once she realized she was his ex-wife.
Jonathan then went to Lonnie's house to look for Will. Lonnie did not care that Will was missing and blamed Joyce.
After a body believed to be Will's was found in a quarry, Lonnie came to Joyce's house and planned to sleep on her couch for a few days; Joyce believed he was there for Will's funeral. Joyce later discovered that Lonnie only came to make money from Sattler, the company that owned the quarry where it was believed Will drowned. Joyce then violently threatened him and threw him out of her house.
Lonnie is an outright despicable man, nothing short of a sleaze. He's a drunkard, uncouth and a complete slob. He's extremely selfish, egotistical, abusive and is virtually devoid of redeeming qualities save for coming to his ex-wife's "rescue" when she needed him and trying to talk her down from what seemed crazy due to having Christmas lights around her house and smashing a hole in her wall as well as telling his son to take a poster down because it was inappropriate, unfortunately this was not the case as he merely came to exploit Will's "death" as a means to make money from Sattler the company that owned the quarry proving he has no love and respect for his ex-wife Joyce, and has even less for his two sons, viewing his sensitive youngest son Will as weak and a waste. He's quite aware of how much his family hates him and is more than willing to spite them.
|Season One appearances|
|The Vanishing of Will Byers||The Weirdo on Maple Street|| ||The Body|
|The Flea and the Acrobat|| || || |
|Jonathan Byers||Will Byers|
- "Look, all I'm saying is, maybe I'm not the asshole, all right?"
- Lonnie was originally planned to have a redemption of sorts.
- In "The Flea and the Acrobat", Lonnie seals the broken wall of the Byers house. This inadvertently blocks the portal of the house, preventing Will from escaping the alternate dimension.