Crafting a story is a very organic process for me, moreso with bigger stories than smaller ones. Tiny one-shots I can usually plan pretty fast, and in a very organised fashion - but bigger stories need to sit around and stew a bit before they can take shape.
I try my best to steer clear of questionnaires like the one you posted - not because questionnaires are bad (they work great for some people!) but because they always lead me off track when developing characters, and my mind tends to be kind of scattered to begin with. XD When I create a character, they usually arrive with a personality and a function in the story, and I try to build from there. I don't need to know what their greatest fear is, unless that fear impacts the story. I don't need to know their full name, unless it comes up in the story - and so on and so forth.
Your questionnaire is pretty on-point - sticking to story-relevant questions - but a lot of the character-creation questionnaires floating around ask things like "what's their favourite childhood memory?" or "what was their first kiss like?" and stuff like that... well. Unless childhood memories and first kisses come up in the story, I don't really need to spend time thinking about it. To get metaphorical, I like to plant my characters, water them with a bit of story, and then let them grow on their own. I get nicer flowers that way.
I usually begin with a pretty general idea of what I want to do, and am inspired by a lot of things. Grassblades was born of my wish to do a story about the mismatched parent-child pair that turns up in manga sometimes (think Lone Wolf and Cub, bits of Usagi Yojimbo, etc.), as well as the wandering swordsman-thing - mixed with liberal doses of inspiration from Hellboy and a truckload of other stuff. I once did a comic all about the contrast between the sea and the sky, with themes about rootlessness, belonging to some place (and some person) and the meaning of home. I've done scifi stories all about being stuck on the ground and dreaming about the stars. I've done comics about selfhood and freedom and impossible choices.
All of that comes first, closely followed by a more solid idea of the plot and the characters - though still pretty open. I jot down some notes to make sure I remember the idea, and then I let it sit for a while. Eventually, it grows into something more coherent - with a basic grasp of beginning, middle and end - and I write down a more solid summary of it.
After that, I pull out my pencils. I sketch character designs, scrap and rework things in the basic idea, scribble outlines, etc., and eventually, I sit down and do the thumbnails/script - which is really the same thing for me. I can't do a written script and THEN do the thumbnails for the page-layouts. It all has to come at the same time, or I mess it all up.
So. Vague idea -> stew for a while -> brainstorm/solidify the idea -> design/redesign/scribbles -> script/thumbnails -> comic.
There are sidetracks and changes to this process depending on which comic I'm working on, and what happens along the way, but that's the basic idea.
... Also, I have more ideas than you can shake a stick at. Committing to any one of them is a titanic effort, and I've really set myself a task with Grassblades; it's going to be a huge project.