Hello,

All Wormhole sites will spawn Sleepers instead of the normal Pirate Rats you will find in 0.0 Null Sec.

C1-C3 Relic Sites are the same ones you will find in Null/Low Sec.

Class C4+5+6 Sites will have powerful Sleepers that require you to be in a Fleet or a Bling fit Marauder/Carrier. I use a Vargur for doing C5 sites, but usually corps will use,

2 Web Loki
1 Triage Archon
3-5 Dreads
1 Support Carrier (Thanny/Archon usually)