For me, a complete striker is someone who can create an assist as well as score - someone who can change the game within one action.
I am going to tell you how I became that type of player myself, but I don't think there are many of them at this World Cup.
Some teams even prefer to play without a striker at all, but in the big moments I always think you need someone to finish the actions, as well as start them.
England have Harry Kane, who I love to I watch, but France's Kylian Mbappe is the player who stands out as the being the best at doing all of those things I have mentioned, all together.