Dont know about all the tools but I can suggest several:
A BOX of single edge razorblades. Cant have enough.
A BOX of Xacto blades and the proper handle. I want to say #11 but I am not sure. Once again, cant have enough.
A fine toothed back saw.
5 minute, 10 or 12 minute, 30 minute epoxy.
A building board of some type. I use one of the Great Planes boards but you can also use ceiling tile, the 4X8' stuff.
Push pins, either "T" pins or those eastern euro pins that Hobby Lobby sells. Those are very slim and much better than "T" pins IMHO.
T-bar sanding blocks, I would have 3 minumum and coarse, medium, and fine sandpaper. The stuff that comes on rolls is great. Check Tower Hobbies.
Plans protector, comes on a roll. Great Planes makes some.
Thick, medium, and thin CA.
Sigment (made by Sig) glue is great for glueing sheeting together and is SANDABLE.
If you are going to keep building kits, a Dremel tool is indespensible. Hell, it is handy as hell for ARF's too. Nothing better for carving cowls.
A grip of clamps of some kind spring loaded is preferable. I bought two tubes (22 per tube) from OSH a couple of weeks ago, each contains various sizes.
A good set of hex drivers. Heck, two sets, one for home one for the flight box.
Popsicle sticks.
Etc, Etc, Etc, no matter what you see listed in this forum, you will find you will need something not mentioned.
I could sit here all night with suggestions and keep thinking up new ones such as steel rulers, long straight edges, squares, pencils, pens, sharpie markers, Great Planes iron on stripe maker (love that tool!), Heat gun, iron, trim iron, hot sock, hot glove, lots and lots of razor blades (yeah, bears repeating), Dead Center engine mount marker, hinge slotting tools, etc.
I am sure the next guy will add at least as many items as I have listed here and not duplicate a one!
As long as you build kits, you will add tools to your collection of "Must Have" items for building.