Hybrid's are classes that are a mix between 2 or more classes of the same realm. They are generally good at all basic abilities from their classes, but are masters at none.
In Albion the Hybrids are:
Friar
Heretic
Paladin
In Hibernia the Hybrids are:
Bard
Champion
Valewalker
Vampiir
Warden
In Midgrad the Hybrids are:
Skald
Thane
Valkyrie