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I, as a man who likes very much eating, anything homemade is a good present and means more than a bought present in a store.
It could be a dessert, something that doesn't require much preparation but I'm confident that it would be a lasting memory ;-)

Homemade food/deserts + hand written letter + origami heart and wrapping/shapes/animals:

http://www.handmadecharlotte.com/6-fabulous-diy-origami-crafts
http://www.origami-fun.com/origami-heart.html
http://www.origami-fun.com/origami-dragon-video.html

If that doesn't impress the guy, nothing will.

Maybe a tshirt with something he likes? If you cant afford it you can just buy a plain tshirt for like 2$ and print something on it and generally make it simple, diy and original. That's always my plan B if I'm short on money but have to please family or friends.

"something which would make him remember me" + "no sex" = my head just exploded :D

Seriously, though, this is purely just a kindness thing? You have no further interest in senpai other than to thank said senpai for his kindness? I dunno...do you have lots of pictures of the time you spent together? A Shutterfly book? That does take some money, but not a lot.

Do you write (poetry or otherwise)? It's amazing how much a physically written work becomes a memorable thing if it's done well.

being a senpai myself i'm always in for some tasty food if no sex allowed. preferably both of course.

you could come up with some selfmade item but you're in danger of handing something over that will end up in the next litter bin as soon as you are out of sight.

do you know his astrological sign? there are some nice books about one or all signs. even if you don't believe in that shit it is rather interesting. especially if it's one of the funny books.

as you can see i'm kind of bad at this as well. soon it's christmas and i don't have any presents yet.

No sex uh ripu I don have the ideus

give him a good meal :D

I'd say cakes/cookies would be nice present, but since you want something that'll last long you could buy him a non-expensive necklace or t-shirt with something he likes on it (t-shit of his favorite band for example).

Why the hell are you saying senpai?

no sex :'(

When you take sex out of the equation its so hard (yeah, is that simple).

Anyways, i would suggest making him a cake (this one specifically https://www.youtube.com/watch?v=qyLLOctx7ZU)

And also give him a card, you know, those that have many folds with a message on each unfolding. Home made of course. Ill be a very nice detail, and i can almost assure you that he wont forget about the cake, they are so tasty and really easy to make. I made a couple myself and i have both girls on the palm of my hand, and i didnt even made them in that way, just as a nice detail.

Home made pizza also works.

a penguin made out of twigs

"P.S.: No sex."
"he deserves more than something that will last just some minutes."

Sounds about right I guess.

Eh, anyway, give him a customized bento box, contents optional. Practical, personal, not neccesarily expensive. And it will last longer than a single lunchtime.

What the f is a Senpai? Can you kill it? Does it taste good?

You didn't tell much. What is useful really depends on person, and what is relevant - on level of communication/friendship.

Singing a song playing a guitar can be nice and memorable. You can buy some accessory of a sporadic daily use which can last for years. E.g. some classy/fancy jacket comb (small slim one which can be kept in the front pocket of jacket/shirt), but it makes sense only if he uses these classy jackets. Don't know how much any of these can cost. A fine tie or cologne can be really expensive..
Otherwise. Unique wine opener or stopper? Refillable metal cigarette lighter? Some rare belt buckle? Maybe some fancy tea/grog cup with glass-holder. Something useful, stylish and longevous is always great. Not necessarily expensive.

The way to someone's heart is through the stomach >u<
Like what so many people said, a custom bento / cookies / cake but Senpai doesn't like desserts……(make sure that you senpai does not dislike it) would do it!

You could ask some friends to help you to prepare as a surprise party, then make your senpai goes into the trap but later you realized that your Senpai didn't notice you, and he only remembers your friends QAQ!!
Or you could prepare it yourself if you want ^^|||

Try asking him out (it's not date) to play together or go somewhere else (again it's not date).
Take some photo as memories (hum…it's not date?), then as the last part… kiss Senpai, then…you know what happens… (Well…it's not sex?) ask him if you could find him in both free time (just going out to play together)

Maybe you could made something you made by you own (like a scarf, little items as origami / hearts / some letters, or it could be a little album of you two) send yourself as a present for him

P.S.1
Anything mentioned doesn't really need to be expensive, home made is just good. because it includes your feelings and heart in it ^^

P.S.2
Wish you luck to make Senpai noticing you! 0u0

P.S.3
If your Senpai is jagaimo, idk what you could do…

make urself the present

album,sing for him

We dont know what he likes but yeah
You could do a Box with some photos about good memories and a nice cake/cookies or snacks he likes .
A nice Letter in it .
and a small gift ^-^

a party to remember? take him to mexico and get him a backstreet circumcision...

i found a job for you to make him happy, it' a blow

秘密
A good idea.. Maybe just give him your 秘密 :P

View attached image.

No sex, no money for a present.
No food either (why not?)
Then give him a handwritten letter telling why you appreciate them as a person. May be more impressive as nowadays most communication is electronic.