Beast

Beast is another of the First Class mutants, one who stood beside Professor X from the beginning until the end (so to speak). Nicholas Hoult portrays the character, after Kelsey Grammer played the role in the original trilogy.
Until now, Beast struggled between trying to fit in and being a mutant – this was his story since First Class opened in the cinemas. Apparently, after seeing him both furry and in human form in the trailer, this storyline will continue in X-Men: Apocalypse as well.
Also, it can be expected for his relationship with Mystique to develop as well – there was a certain and quite visible tension between them in the previous installments. As far as he is concerned, Beast will most likely be one of those who firmly stands his ground against Apoc.
If we are to assume anything, we would say that this movie is the one in which he becomes Mutant and Proud and embraces his unusual appearance. Since Apocalypse is such a terrible foe, we can expect for him to realize that he needs to remain Beast for all the time in order to stand a chance. While he is a genius in both mods, he is certainly more useful when not hiding, the serum effectively reducing his strength and agility.
As the ending scene of Days of Future Past has shown, he does come to terms with who he is.
