Requesting a script if possible.

Hello, I am generally new to RPGXP, but for what I need it for I believe I am doing fine in terms of mapping, setting events, and balancing the game with custom variables. What I want to do though for my game is be able to evolve my character or transform them when they get to a certain level. Let's say I want my character to morph permanently into a different sprite when they turn to level 10, 20, 30, 40. Is that even possible? Also, would I be able to do this without scripts? I was planning on doing it in a conversation event where you could pick and choose your skills from a bio engineer who would then, after making your selection, would make the changes to your character. Please help if it is at all possible. Thank you.

ok, this can be done MANY ways.
for the transformation one. Make it so the character learns a skill at the level he transforms at. then using a common event set it to a conditional branch: Actor>Skill>______(what he learns at that level) un check the (set handling conditions) Then under that in the branch make an event for "change actor graphic"