Before i get into the build just remember that your build matters a lot, a lot it dictates your play style one of my friend (he's a challenger in lol) told me this if you go for a sustain type build that allows you to 1v3 and then if you suddenly start using a burst build you'll suuck cause you have learned how to play that hero a certain way which doesn't suit the burst build; hope you get the point..

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Currently i'm new to fanny so i got for more sustain, but here's the ideal build that i would kinda use along with the explanation

1. Bloodlust axe: this is a great item why? it gives you early game sustain and damage and on top of that 10% cdr its a godly item trust me, i tried blade of despair as a first item on fanny but it kinda doesnt give you sustain that you need while wall spamming; mikasa goes for it as his first item but that's his play style he prefers burst over sustain so that he can kill the squishes and gtfo..
2. Warrior/Tough boots: if they have an aurora/hard cc then i'll go for tough boots otherwise its just warrior boots with the old nerf on her energy you cant waste it for petty stuff you kinda have to save it for potential kills..
3. Magic Blade: this is a great item and a wake up call that you are in trouble and need to gtfo asap; don't need to explain much about it now do i? <.<
4. Immortality/Athena's shield: Now if you are going for the sustain type build aka the 1v3 build i'd rather go for immortality early on cause dying means loosing potential exp and gold, imo going for immortality early on saves you from a lot of trouble and boosts up your survivability by god knows what limits.. for me like immortality makes sense in early game cause you wont be 1v5ing in the early game and incase you mess up in a 1v2 or 3 it is forgiving whereas in late game i dont think it helps much unless your team isnt dead and someone is there to help you.. but then again your call
5. Endless battle/Malefic roar/Thunder Belt: now ermm getting either of these items kinda relies not only on your play-style but on enemy team picks too, malefic roar gives you the dmg for split pushing like a god and also the amour pen necessary against high Armour items like blade armour and tanks like johnson.. whereas endless battle gives you sustain and pure dmg honestly i'm also super confused rn on which item to go for like malefic is good for split pushing and whereas endless battle is good for team fights/sustain bot items give you a way to get past the amour , while malefic gives armour pen, endless battle gives you pure dmg.. Wondering why i even wrote thunder belt welp imo its the most underrated item; people usually go for Endless battle due to the life-steal mainly but this item not only has aoe dmg but a slow effect too let me repeat that shit again Its the only item that has an animation effect to go along with the slow effect! what does this do the animation along with the slow effect gets to your enemies head! it fukin gets to the enemies head and has an aoe effect what more could you potentially ask for? so yeah its a great item for 1v2ing and even some 1v3s when they have more physical dmg
6. Situational: What did you really expect me to give you the last text book build item? well no im not yo average cup of tea! so what item do you get? well it depends if you think you lack damage you get blade of despair, if you need more sustain/survivability get some wings man, need more magic res get oracles(only buy oracles after getting athena's shield cause its passive compliments Athena's shield and immortality's shield)/Athena's shield, need some magic dmg get clock of destiny jk faget, need more hp and Armour grow some boobs i mean get brute force breastplate to hide that cleavage (on a serious not plz dont hide em and send vagene and bobs nudes plz), dominance ice if they have a high crit type hero unlike lesley and so on just use that thing located right in the middle of your ears kek ;)

Also one last thing you dont have to follow/accept what i said find what suits you a sustain type build that allows room for mistakes and awesome 1v3s or a burst type build that allows you to r4pe that wifey layla its your call homie ;)

Also lets duo someday