I LOVE LIECHTENSTEIN she is absoulutely one of my favourite characters
first of all I don't love head-canoning her as some helpless little lamb😭i think she can be a bit naive and isn't like vulgar in anyway but i don't like writing her as a literal child because she's not!!! she's been alive for so long and clearly had a life before moving in with switzerland. i think she's proper, polite and cute but not immature!!!!!!

as for ships i like hong kong/liech and seychelles/liech. i also like switzerland/liech, ame/liech, liech/iceland to a lesser degree.

every combo of seyliechhkice is something i ship, i loveeeeee headcanoning the four of them as friends since i think they would get along :3c they're all the youngest of their "groups" (minus seychelles, but she's still fairly young!)

i dont think i have any particular nsfw headcanons for her but i do think in nationverse she's only really interested in switzerland... its hard to imagine her having sex with anyone else (maybe ill write a fic where all the incesty nations talk to each other because god knows theres a lot of them)
anyway im a sucker for cute blondes....