For me it was my hunter. I loved it since day 1. I've completed all three subclass quests, all hunter milestones in the AoT book, and got most of my exotics on my hunter, and transferred some to other characters. It might not seem like a big deal, I know. What character have you spent the most time on?
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Titan, then warlock. Completed the quests for all three. Hunter was easy since I loaded the vault with excess weapons from the other two. Was at 40 max light in no time. Hunter just doesn't do it for me. Using the warlock a lot for the self res on NF solo and started trying to solo CE at 390 with hunter. Having to get used to the hunter for this.