Aye.

What you need is all the different classes first of all, and a common event for each new class - for each character (we're talking about a lot of common events here. Say each character can have 4 classes, which changes as they level up. And you've got 6 characters... that's 24 common events. Talk to BC, he can probably cut it down to one for each character).

Basically, the common even (parallel process) is a conditional branch that checks to see if the character is a certain level (fig 1.). If the character IS that level, then it chages their class (4th page of events), and could show a little message.

fig1 shows the conditional branch.
fig2 shows the change class.
fig3 shows the complete code.

EDIT: As you can also see, in fig3, I cannot spell nifty.