Murph

Intro
Murph is an intermediate-sized black hole and is the closest black hole to Kerbol. It is around 40% the size of Kerbol and the Sun, but nearly 100000 times its mass. That is because it's very dense, as with all black holes. As a result, its gravity is extremely high.

Planetary system
It is relatively unusual for a black hole to have a planetary system, but Murph does so. It also has three wormholes. The celestial bodies are:

Doyle, a relatively earth-like planet orbiting just outside Murph's roche limit.

Algal, a greenish also-earth-like planet with a small mun-like moon, Izetta.

Anomaly-WH-35325-B, the wormhole that leads from the one orbiting Jool.

Anomaly-WH-17823-C-1, a wormhole that leads to Njord.

Magister, a rocky planet snaller than Duna, with weird green spots and a gigantic ring. It has a shepherd moon, Magio Masso.

Anomaly-WH-17823-D-1, a wormhole that leads to the outskirts of the Klaus system, surrounding Klaus.

Romily, a mostly ice planet with some lakes of water and a super-eccentric orbit that penetrates Murph's accretion disk.