I think its fun.
Planning out characters its fun and a way to pass the time and come up with ideas on how you are going to create a character, and since the game is so far off....might as well, again pass the time. I know these plans are unlikely to survive the first gun shot...or however the old sod goes, but meh, it works for me. Especially since I know what I like. And on top of it I am an aspiring writer, and one of the reasons I love RPGs so much is it lets you create a character within a certain template. This is practice, and some of these ideas may make it into my own works.
But nevertheless I have 3 main Inquisitors planned so far. May be the only 3 I do but you never know. 
1.
Human/ Male/ Mage
Specialization: Knight Enchanter
Personality: A pro Chantry Mage loosly based on Obi Wan but is becoming more and more disillusioned with the Circles with each passing day. Deflects tense situations which sarcasm and some slight humor, but is pretty serious a lot of the time to deal with the situations before him. He walks a fine line between Order and Chaos as he believes in the Chantry Theaodisian Governance and law and order but often bucks against those insitutions, and becomes increasingly convinced they need serious reforms throughout the game. Is politicially astute and knows how to play 'the game' (no not that game) but despises politics deep down.
Background: A mage from the Nevarra who was called in by Knight Commander Gregoir just after the events in Kirkwall to look into forming a new special groups of mages who are detecated to hunting down Maelificar and Abominations. The goal would be to eventually integrate mages into society and let society know that not all mages are evil. Sadly the Mage Templar War and Inquisition interfered with these intentions.
Ideal Party: Given his personality he is going to be more of an 'order' party, he will tolerate the people in his squad who is not part of the Chantry, but he prefers Cassandra, Varric, and Viv.
Romance: Cassandra
Female/ Human/ Rogue/ Bow
Specialization: Assassin
Personality: In way over her head. She has never had responsibility really for anyone other then herself. Has been a loner most of her life and relying on her own talents, wits, bow skills, and occasionally her looks to get by and blend in. Does not trust most of the authority figures in Thedas even though, in theory, she has no real problem with the Institutions themselves. Is borderline atheistic however. Has a quick wit and a sollid sense of humor, despite herself. Is not confident in her abilities as a leader however and relies on the other members of the Inquisition (especially Cassandra) for support and advice. Asking questions like: How could the Maker chose me? Why did I survive? Am I worthy and capable of leading the Inquisition. However, it will be her struggle in the game to grow into the role, accept it, and become a good leader of the Inquisition.
Background: Orphaned at a young age when her mother died in prison for owing too much money to the wrong people she was set adrift on the streets of Orlais without any other family and any other support structure around her. Drifting among one Thieves guild to another, one Assassin's cell to another, and joining the occasional hunting party. Eventually found it better to just go it alone and ply her skills purely how she saw fit to survive.
Ideal Party: She will likely be the 'chaos' party, those who do not get along with the Chantry or their own people's laws (with one obvious exception). So possibly going to be Varric, Cassandra/ Iron Bull and Dorian (if the rumors are right about him).
Rommance: Cassandra (my first Lesbian
if Cassandra swings that way that is
) or Dorian (again depending on what I have heard on the rumors about him).
Female/ Qunari/ Warrior
Specialization: Likely Reaver.
Personality: About as untypically Qunari/ Tal-Vashoth as one can possibly be. Has an infectious smile/ sense of humor. Into politics and economics. Is very self possessing and confident of herself as an individual and in her position of the world, even as that of the Inquisitor. Very Warm, very friendly, hard not to like her ( I hope
) Only thing is she is very fierce and aggressive in combat, fighting very hard and fast in order to kill whatever is in her way and does not stop till they are, or they relent (if they do).
Background: None really planned yet.
Ideal Party: Likely Solas, Cassandra/ Iron Bull, and then most likely the Grey Warden...or Sera.
Romance: Hoping Iron Bull but I suspect their personalities may clash. Otherwise...Solas I guess. Or the Grey Warden, IDK 