Personality wise, it's hard for me to say.
I've played Halo since Halo 2, so I know how MC is in battles, & from my own arbitrarily online adventures with Spartans.
From Destiny, I'd probably say someone who is just the bad ass killer that gets the job done, Hunter.
Titans are like the noble, courageous class personality wise.
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Yeah, I couldn't really see him having a Titans personality in some ways...