For oneshots that have interesting concepts:

At the Gates of Heaven [SCP-7528] - ContinueEclipse

"Something funny has been happening in a small town in South Korea that's resulted in an unusual string of violent suicides. The Daegu branch of the SCP Foundation has taken measures to evacuate the area, but one individual remains: the source of their problem, an anomalous individual they've come to call "Saint Peter.""

Featuring SCP Dahyun, SCP Sana, and SCP agent Jihyo. Sounds like this one could have been continued but author forgot to TT Very adorable.

Available in AO3

elegy to a dying breath - judjira

"Avoid listening to any voice that cannot be physically observed coming from any nearby personnel, at all costs."

Post apocalyptic world with dangerous SCPs around. Author nailed the horror vibe.

Available in AO3

One Night in Tokyo - steamed_hamsters

"Sana meets a fascinating woman in Tokyo."

Another story that hits into my favourite genre, spy and thriller. Sana's really cool in this one. Would be interesting to have a longer one?

Available in AO3