Someone is sending me faucet ltc, but I gave them a real litecoin address,
Faucets from where? There are telegram faucets, websites ltc faucets. And there are some feedbacks if they are legit or not if you still have doubts. Anyhow, I habr tried telegram faucets and yes they send me some ltc when I reach the minimum amount to withdraw it.
How will it behave ?
Will it appear on the blockchain like a real transaction ?
Faucets ltc is still coin and if it is true that they will send it to your ltc address, then there is no problem and you will gonna received it fast. You can traced the transactions and see the confirmations in the blockchain.