So I'm playing a Tiefling Fiendish Vessel Cleric in a home game and I had some questions about the familiar I would get at 3rd level.
1. If the familiar is currently invisible and I decide to channel through it, does it stay invisible or does it become visible?
2. If I get an imp familiar at 3rd level via the Fiendish Familiar ability, does it get the Improved Familiar feat's benefits?
1) That's actually a good question. There are some threads around that are inconclusive on the matter, but the argument seems to be that as long as you can Present it forward, it doesn't matter if it's not seen. It seems up to the GM to interpret what "Presenting" means in this scenario. I'd personally argue the symbol needs to be visible, for it to be meaningfully Presented.
2) Not sure what you're asking. If you're asking whether your familiar gets a familiar of its own, I'd say not. What benefits are there in the improved familiar feat that you're looking at?