Lustik is a fun color font with a strong mid modern identity. It is based on shapes which create the letters. You can add an overprint effect on it to reinforce the vintage/retro style.
Lustik is also a layered font. So you can use any color for any letter as you can see on the examples here. It can be used for old vintage style posters, book covers, packaging, or for fun and children related stuff, just like birthday invitations for example.
Note: Lustik being a multi layers font, it makes no sense to use a preview here, as layers would be shown separately.