With effectively 7 codexes worth of Special Characters to get through there's quite a list so I won't be able to cover them all in as much detail as other books. Remember each character has a specific chapter now so, whilst you can combine chapters with the allies system, you'll mostly only see characters from a single chapter. The Ultramarines have 6 of them and frustratingly the Iron Hands don't get one at all so there's a bit of injustice there I think.
I'm not convinced he's worth the hefty price tag. In combat he'll be excellent but he's only got a 4++ save if he meets something chunky in combat like an MC. Still being able to re-roll to hit for two turns with the tactical doctrine could be effective. Personally I doubt we'll see him outside of fluffy lists.
Chief Librarian Tigurius
He's not without his issues though. He's not got an invulnerable save and only 3+ armour so he's not all that survivable. Delivery is an issue. He'll be great attached to a squad and handing out powers but depending on what powers you want to use getting him into range might present problems. Finally, his force weapon is a the Rod of Tigurius which is only AP4. With so many multi-wound models out there at the moment an AP3 weapon would have more utility. Still S6 with Master-crafted and Concussive has the potential to make up for it. You only need the target to fail a single save after all.
I have doubts over the effectiveness of a biker army. Of course they're very mobile and tricky to handle but they'll need some decent anti-air support to prevent heldrakes from making a right old mess out of them. Still if you are wanting to spam bikes then Khan is the way to go. I'm saddened to see that the SM codex can probably make a more effective biker army than the DA one though. Dark Angels are massively let down by lack of anti-air so perhaps bike fans can find solace in the marine book.
That's half way through the special characters then. Come back tomorrow for the rest.