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Now that that's out of the way, i want to set my proposal up right so that you all can see where i got my conclusions, so ill start with an analysis of Raynor BW to WOL. (disclaimer: long long post)
So lets start!
In WOL blizzard decided to focus SPC (single player campaign) on telling a personal story about Raynor specifically and his movement to overthrow the dominion (not that he ever got that done). This represents a marked shift in the genres previous SPC's wherein the struggle of power between the three races was the main focus of the SPC story with a dynamic interplay between many different characters of multiple races spiced up the more generic campaigns and interludes between gameplay. To clarify, one couldn't say BW or SC1 was all about Raynor, as there was zeratul, kerrigan, and others given equal lime light, none of which became the overall focus of the game. Whereas, in SC2, Raynor is given much much more screentime and becomes the general focus of the game.
Now i realize that not everyone agrees with this statement in its entirety or all the reasons for it and that there have been many posts debating this. It is not my intention to rehash these arguments here, i merely mention this shift because it impacts the next statement.
Because of the previous (and im sure for other reasons too) Raynor has achieved much more focus and, his character has been fleshed out much more to reflect this increased attention.
This is a good thing because when a character is given a lot of attention while not being given enough depth to match, they tend to become very one dimensional and boring.(again a personal opinion, anyone who disagrees is entitled to it).
As such i will analyze Raynor's character in SC1+BW, then his character in WOL.
BW, as stated before focused a lot on a big overarching story of politics and power struggles both within each of the three races and between them. In this main plot Raynor was an important but relatively minor character, he only participated in a few of the missions and we only saw him in the brief interludes between the campaign's he was involved in. He basically acted as your sidekick. There was nothing wrong with this and all of the BW characters did the same. That being said, his role as a character was rather limited within the entire setting of the game and his personality at that time reflects these limitations.
In the aforementioned dynamic interplay between the SC1 cast, Raynor generally took the roles of the gung-ho optimist and the jokester. Raynor always had the quip, he was almost always optimistic about everything and even when the events in the game do get him down, he was never down for long as he would end almost all of his dialogue with some form of joke or entertaining statement, even when thing were at their bleakest, like when the overmind stood poised to lay waste to aiur and the protoss were struggling to defend against it, he ended his dialogue on a high note. He was the guy who encouraged the player and his fellow heroes when times were grim, it was his dialogue and personality that lightened the mood and made the conversations between the more serious characters (zeratul, tassadar, etc) from becoming too serious and therefore boring. The rapport between him and fenix in particular made the conversations during the protoss campaigns much more lighthearted and entertaining, especially considering the dark and depressive plot.
The actions Raynor did do in game showed that he had a fearless upbeat attitude an indomitable spirit and a relentless drive to accomplish his goals, like when he defended the warpgate during the end of the first protoss BW mission, declaring that he and fenix would be fine and you (the player) should head on through while they stayed behind seemingly for suicide mission (though it did not work out that way), or when he brought an entire fleet to fight you in the BW zerg campaign last mission in order to fulfill his personal revenge to kerrigan. This also synergizes with the other emotion raynor primarily shows, righteous anger, like when fenix was killed and he gave his speech to keerigan about her lack of humanity and vowed to kill her one way or another or his conversations with mengsk when he encountered him after mengsk betrayed Kerrigan. This emotion provides the drive that let raynor overcome the many obstacles placed in his way in SC1 and BW withut succumbing to despair or depression.
It is the interplay between these two emotions that defined raynor’s characterization. He started out more with a jocular easygoing attitude with brief forays into righteous anger and focused drive. But by the end of BW his personality shifted to a more angry, driven and focused attitude with only brief glimpses of his previous jocular one. This shift culminates in his vow to kill Kerrigan, one way or another. I is assumed, from everything we knew about Raynor’s personality in BW that he would continue on this course to try to kill her and any sequel addressing raynor would depict his indomitable spirit, relentless drive and righteous anger.