No more weapon based bosses where you can beat the boss with the weapon or item you just obtained.
No more stunning the enemy and then hitting the weak points (which are usually even marked with flashy colours).
No more repeating the same attack strategy trought the boss fight. (hit all the weak spots three times then when it falls hit the head... repeat this three times then it will "suprisingly" transform into something else)
No more tentacles, please, or unimaginative "plant like creatures".
No more bosses that WE can think of, something new, suprising, that will really suprise as all and really refresh the series.

So not so much to say how the boses SHOULD be, more what i dont wish to see again.The bosses will be harder when the fight system will change, if it stays like this then all the bosses will be easy, or then just painfully annoying to beat.

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