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Wolfraing
The protagonist is without doubt a coward, but rightfully so.
Sure, Fenrir is basically invincible, but he is not. He can fall off his back if he runs too fast, he can easily die if he get into a fight with a monster.
What if another monster jumped from behind while Fenrir is fighting the pack? What if a stray shot hit him by accident?
I understand it can be annoying, but his alarmism is well balanced by Fenrir's laidback attitude, and justified by the situation.
It looks like good writing to me.
Also, he just recently started fighting monsters... he is still growing.