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Hmmm... Does that mean that the word maybe, or может быть requires the instrumental case

Может будет кошкой некрасивым

Alright. Does it still apply if the verb is conjugated?
Завтра, я буду рыбой.

Right... I keep forgetting this stuff about instrumental after the word быть. Am I to use the instrumental case after the infinitive of быть always?

I prefer to go up to perfect strangers and start yelling at them "Я ХОЧУ БЫТЬ ТВОЙ ДРУГ!!!"

The fact that you've done dative and prepositional, and not accustive scares me too.

The numbers 2, 3 and 4 take the genetive singular.