I hated that girl the moment I recognized her archetype. The overly positive, gullible and with extremely/religiously high sense of her own morals of how things should/shouldn't be done. I bet she's gonna be like a tick on the skin of our protagonist and prevents him from executing his revenge how he feels like.
Also damn this mc is such an idiot. 10 years to master his techniques in that coffin, but didn't think through his plan if/when he gets out, and didn't take into consideration that maybe the enemy has better weapons/gear/techniques now, and he might be extremely weak and lacking crucial information about everything?
If you've waited 10 years in solitary, then waiting a few months/years even (free), gathering resources/manpower and you strength, wouldn't make much of a difference.
His way of acting is just idiotic and plain suicidal.