First up: Nephtys, Others to come later (Probably not right away)
I don't know much about Marshal, But I did find
This link, I presume that's the one you're using?. If so, I'd ask you not to, I don't particularily like some of those bonuses, especially being party-wide.
My suggestions to replace it would be: fighter 2(+1BAB, bonus feat), Monk 2(+1BAB, Evasion and either Combat Reflexes or Deflect Arrows), Barbarian (+1BAB, +10 NON-Enhancment speed and rage), Exemplar(Skill Mastery for 10 skills), Horizon Walker(various useful abliities).
Or you could start looking forwards, and figuring out how you want this character to progress, perhaps taking levels to get yourself towards pre-reqs on something you want but can't have yet, or the first level of a class you want a higher level ability of.
HD: Your racial HD for the troll are Dragon HD b/c of Half-dragon, so
they should be D12's with Full BAB, 6 skills/lvl, and good all saves.
*The following math leaves out your last, unknown level
BAB 13 (12 Troll + 1 Fgtr)
Fort: 49 (8WT+27con+10insight+2fighter+2monk)
Ref: 40 (8WT+20dex+10insight+0fighter+2monk)
Will: 38 (8WT+18wis+10insight+0fighter+2monk)
Skills: 266 *I don't count Inherent bonus before start of campaign until 20HD, so you won't get it the bonus skills for it until you level up in game*
First off, why so many Symbols? *#¤?
Secondly, why Great Fort? +2 fort save is not exactly all that useful, I'd suggest finding something else
Power Lunge : Where'd they update this? Only place I've ever seen it is Swords and Fist, which is 3.0
As for the rest of it, you still need an Equipment list before we can figure out how the numbers stack up to the others.