Yes, there are a few.
'Fissure' only destroys one monster. But you never choose the monster when you activate Fissure, meaning it does not target. Even if you 'know' which monster it will affect, it only makes the selection on resolution, and conditions on the field can change, meaning it might end up destroying something else instead.
Counter Traps and many negation effects are used against 'an activation' or 'a summon', they do not target the monster itself, even if they also destroy it.
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Yes. It will be destroyed by battle by anything that has an ATK of 1 or higher (A monster with 0 ATK cannot destroy another with 0 ATK even though they are equal and normally equal attacks mean mutual destruction.
Assuming the defending monster is also in attack position, both monsters will be destroyed.
Five-Headed Dragon.
Unless the monster specifically says otherwise, it takes two tributes for a monster of Lv7+
yes its name is dark blade