Henry Lambton.

Lambton is a rich and powerful man whose motives remain unclear. The reason for his interest in Lynch also remains a mystery, as in the City of the Damned, Henry confessed that he no longer needed his services.

His surname has English roots and comes from the name of a locality in Durham, England. Like his name, Henry demonstrates a high level of literacy and organizational talent, which suggests his noble origin. This, in turn, explains his manner of speech.

Lambton claimed to be a businessman, an innovator, and a collector. It is unclear what kind of business he represents, but the fact that he is rich and influential confirms his words about himself.

Lambton is always cool-headed. Horror stories don't show any emotions other than composure and anger.

Lambton is a man between 30 and 40 years old with gray hair. There is something resembling a burn or scar on the left eye. Lambton often wears a black jacket, possibly leather, with a white sweatshirt underneath. He's wearing silver-tinged boots.

Egor was tempted to kill Lambton with the death note, but he quickly rejected the idea, and later even gave the notebook to Henry himself.
At the end of the Quarantine horror story, Lambton wanted to kill Lynch and John for destroying the samples, but he was stopped by operatives from the SCP foundation. But after that, Lambton realized that Lynch was much more capable, and he just started following him.
They still haven't explained to us why the foundation just let Lambton go (Lynch didn't even mention it after the Subway Horror), maybe Lambton has connections or he's just too famous and influential.
Henry has his own portal, through which you can travel through time. This is shown at the end of the horror story "The Queen of Spades". It is powered by electricity, unlike Lynch's portal, which is why it is not as powerful.
Information from the stream on 02/25/2024: the correct wording of the surname is Lambton, through B
The bottle of alcohol given by Lambton Lynch in the horror story "Very New Year's Stories" is Armand de Brignac Brut Gold champagne, which costs more than 100 thousand rubles. This once again highlights Henry's worth.
Perhaps it was he who arranged the death of Colonel Sanders so that Lynch would have no connections in the foundation. However, there is no evidence for this theory.
If you look at the sources, the Lambton surname is aristocratic, has English roots, and is based on Lamb - Sheep.
The place where Lambton holds the portal is located under Lenin's mausoleum, the entrance to which is through a sarcophagus (according to the events of Metro 2066)