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I don't agree that Ossir is a bad hero; he's actually quite good, but he struggles against Helmar because Helmar has defense against ranged attacks and magic. Plus, my luck only kicked in a few times, and even then, it was mostly in melee combat.
I don't know about Erin; maybe she would have had a chance against Orson, but it would have been very slim because the luck reduction effect works almost every turn. But I don't deny her damage output; however, she has no defense and gets taken down quickly.
I'll leave Razak without comment.
There are two weaklings, and the third one is, as you said, more or less decent.)))
Ossir is definitely not "more or less"; he's much stronger.
I think Helmar will always kill Ossir O_o
That's not true. There's no hero who will always kill Ossir.))) There are heroes who have good chances against him. Helmar is definitely one of them, but it's not a 100% certainty.
Evasion, you see, can be removed...