I choose you Pikachu
Sometimes its the most obvious plays that will end up performing the best. The 30th anniversary announcement has just reminded people that Pikachu IS the main character of Pokemon.
Vintage Pikachu cards will only get in higher demand over time as long as more people enjoy and get into Pokemon.
There is no seasonality, no new generation to replace him. If Pikachu is to be replaced it means Pokemon was replaced and Pokemon is past its prime.
I would say excluding my No Rarity Collection, 80% of my remaining collection revolves around Pikachu.
If you don’t have Pikachu in your set and you really consider yourself a collector/Investor i really think you need to rethink your investment thesis.