What anime or manga characters will most likely stay in your favourites forever?

OK now I know preferences do change over time but which characters do you think will be in your favorites for the longest time or even indefinitely? I haven’t watched/read enough yet to really say, but for me it’s probably Gintoki and mayybe Okabe. The others I can consider dispensable even though I do like them for one reason or another but not enough to feel that they will be favoured for years to come.