Bisexual

Someone who feels attraction to all genders
Could be with or without a preference

thats pan

Nope. Bi people like all genders just like pan.
However pan is genderblind. Most bisexuals will say that gender has some impact on how they feel attraction

thats omni

Technically yes. I'm bi and my sexuality shifts between having preference and not having one. I don't care to look for a more specific label so I'm bi.
Many people have identities like this where they just want to express that they like all genders but don't care for specific labels. So they call themselves bi.
Bisexuality is not limited to two genders.
Or any number
We tend to love people above all else

Someone who feels attraction to two or more genders, for example, male/enby or male/female

Boys and girls are hot