This post is to list known information about hybrids. Where you got the mission and the stats on the hybrid. When you finish a hybrid arc, you get a free clone credit and they are much easier than ToOs.
For my level 40 character, got the Thrax hybrid story arc by the Crucible Wormhole. Involved talking to a bunch of people, scavenge for parts, kill a bunch of boss thrax to collect body parts, and kill a thrax hybrid below Khulago base.
The basic stats for a 40 Thrax Hybrid are
127 Body
49 Mind
88 Spirit
10893 health
187 power
153% regen
-10 Fire Resistance
+10 Sonic Resistance
No special abilities. Thrax Hybrids are ugly with a capital Ugg. Advise wearing a helmet at all times if you choose this race. Facial features are scars and other grotesque facial features.
Basic stats for a level 40 human is 88 with 0 resistance, so Thrax hybrids are good for characters that need high body, but low mind.