Final answer:
In the Dream SMP, Jschlatt almost blew up L'Manburg during Niki's birthday party, adding to the immersive storylines of the M_inecraft role-play server.
Step-by-step explanation:
The individual who nearly blew up L'Manburg during Niki's birthday party in the Dream SMP fictional universe was Jschlatt. The Dream SMP is a popular role-play server in the game Mi_necraft, followed by a large community. Storylines like the one involving Niki's birthday party and the close-call explosion form part of the improvised and dynamic narratives created by its players.
In this instance, the potential for disaster was averted, preserving the peace in the digital nation of L'Manburg, at least temporarily. Such events typically involve intricate story arcs that keep the audience engaged and contribute to the overall lore of the Dream SMP world.