I dunno what kind of stuff out there can be used for the rest of his outfit or hair, but generalzoi over at MTS2 has an eyepach that would work for Farfarello: http://www.modthesims.info/download.php?t=109951

Not what I was asking, at all. Here, let me give as best an example as I can.

I find this guy: http://www.modthesims.info/download.php?t=70458

He's available as both a teen and an adult. I download both. However, his description has this lovely disclaimer:

"*PLEASE NOTE* The teen and adult versions were modified INDIVIDUALLY, therefore the teen version does NOT grow into my adult Neville, nor does the adult Neville look like the custom teen version when you turn him into a teen."

What I would like to do is start him as a teen, but have him grow into the adult counterpart I downloaded as opposed to whatever the game proceeds to generate. Failing that, how do I change whatever the game generates to what I prefer?

There are several Sims, not just the one used in this example, I could potentially face that problem with. There's also these guys: http://www.modthesims.info/download.php?t=70962

Or her: http://www.modthesims.info/download.php?t=70435

Or even this guy (no discalimer, but likely in the same situation): http://www.modthesims.info/download.php?t=177624

And then there's this guy, who has models for all ages (again, no disclaimer but likely same situation): http://www.modthesims.info/download.php?t=75460

I recently downloded several characters from the anime/manga "Weiss Kreuz". However, I couldn't find a good Farfarello.

Then again, I also had trouble finding reference images of him. Here's the best I could find, and it's mostly real people dressed up as him:

http://www.cosplaylab.com/cosplayers/costumes/details.asp?costumeid=160524
http://www.cosplay.com/photo/33826/
http://media.photobucket.com/image/farfarello/zerosystemquatre/OTAKON%202006/59a4f5d0.jpg?o=53
http://media.photobucket.com/image/farfarello/Sardhanna/Angelfox/Based%20On/BasedOn001.jpg?o=26
http://www.cosplaylab.com/cosplayers/costumes/details.asp?costumeid=168912

I do not have Bon Voyage, Free Time or Apartment Life but do have the other EPs. The only SP I have is Celebration.

Also, to the person who requested Yoon Eun Hye, unless you had your heart set on those specific outfits in your reference images, skye already made her: http://www.insimenator.org/index.php/topic,103915.msg1555858.html

If this is the wrong place, I'm sorry, please move it for me.

Ok, I don't have SimPE or anything like that, but if it's necessary for the following, I'll get it.

First of all,, on MTS2 I've seen people upload versions of the same Sim at various ages, however the (for example) teen and adult/young adult versions were "modified seperatly", therefore the teen versions do not grow into their adult counterparts. How can I change that, make it so the teen versions grow into the seperate adult/young adut versions (or even child versions into teen versions and so on, if applicable)? If not, how do I change to the other files (which can apparently involve more than just a change of hair and/or make-up) once the "default" aging-related change occurs?

Also, how, if at all, do I alter a Sim's family history and/or memories?