Yes. My ponysona is Inferno Flame and she's a fire element pony so I gave her a fiery mane and tail style and color. People might not think she's a fire element pony if her mane and tail style and color weren't fiery.
It depends. Some of my ocs have very specific mane styles. But others just have a general style. When I describe my oc green, I just say he has messy or kinda spiky hair. But when I describe my oc mithril, I go into detail, because her mane is one of the things that makes her stand out.
Yes, because the mane should be a color that looks nice with the coat color. So, for example my OC, Claze, has a red mane with purple streaks because her coat is blue, and her hair was originally only red, so red+blue= purple, and decided to add purple streaks in the red hair.. Another example, Claze has red eyes which start to crackle like fire when she becomes pissed (angry ) since her mane is red, and fire is usually red, but sometimes blue. o3o
Very. I know I love my hair... When I have to get a hair cut I get sad at losing my hair, and I try to keep it just long enough to be a little unruly. That's probably why I think manes are important, even if I don't get very elaborate with most of mine. Hair speaks.
Oh of course! I think the mane is probably most important. A Pony's body is always the same,it will most likely have the same look as everybody else's. What makes it unique is the Mane. It shows the creativity in the pony,it shows off a lot of color.
The mane style shows how they groom themselves and care for themselves; if they go for the simple, or the complex; if they're frenzied or calm; and so much more. EVERY aspect of design is important to a character, whether or not if it's one you made up for your own story or if it's an OC for your favorite show.
When I made my OC, it took about 30 minutes just to find a good position/wave style for it! Especially when he's standing on his hind hooves, it can get pretty difficult. So yes, mane-style is important.
Yes; it's a vital part of character design, and it's also part of showing a character's personality. For example: Rainbow dash has a short and spiky mane, showing her attitude and style, while fluttershy has a long, flowing mane, which indicates her gentle nature.