Hey, little hero!
If you're reading this, that means one of several things has happened. (Please delete as appropriate.)
1. You were overcome with a sudden fit of evil, ransacked my possessions, came across this letter and decided to read it without permission. While your curiosity is understandable, as a long time, fully-paid member of the Mermaid Man & Barnacle Boy Fan Club, you know the rules: evil will not be tolerated. You're still welcome to visit but I'm going to have to ask you to return the official Mermaid Man & Barnacle Boy Fan Club fridge magnet and pencil topper. Subscription is non-refundable.
2. Since you're usually a good lad, it's more likely that I have been permanently defeated by evil, in which case you should panic immediately.
3. The third and most likely scenario is that old age finally caught up with me. It is with this scenario in mind that I leave you this letter, as I have a few favors to ask of you.
Firstly, assuming that Barnacle Boy hasn't yet suffered the same fate, please make sure that he keeps eating his vegetables. A growing boy needs all the vitamins he can get.
Secondly, and most importantly, you should remember that there was no evil at work here; only the inevitable hand of fate. Contrary to popular belief, most superheroes are mortal. Especially old superheroes. The bra doesn't protect me from death. In fact, between you and me, I really only wear it because it looks good.
Though my time unfortunately had to come to an end, I hope that you are not discouraged and will continue to do for others what you did for me.
Stay safe, stay happy, and stay on the path of evil. Or should that be away from the path of evil? I forget. But you're a smart kid, I'm sure you'll work it out.
Yours,
Mermaid Man