a) He’s a decent choice for that CTP as the dodge gives him more survivability and all attack gives him more damage. Not the best choice for this CTP, but not the worst.
b) Definitely Corvus. He’s a beast with that CTP. The all attack buffs his clones, which do a considerable amount of damage in PVE modes such as ABX or SL (Never use the summons in PVP) and the dodge brings his dodge rate to near the cap, making him near unkillable in TL and AC. I’d say he’s probably the best option for a CTP of Patience. Speaking from experience as I have one on my Corvus and he’s an absolute monster with it. A mainstay in my TL team any week he’s not banned.
c) I don’t have any of those so I can’t give an accurate comment, but I’d say Weapon Hex as I’ve heard she needs GBI and I don’t think she has native pierce so this would help her in both PVE and PVP.
a) While ctp of patience and transcendence goes really well with characters with summons, Nightcrawler is really weak and not worth the ctp. Let's hope for a uni or a buff because I did the same :)
b) Either one of them is really good with the ctp
c) While you can, I think the smart move would be to put it on some end game characters such as Jean