a best friend
A best friend is someone who will stand up for you when you’re being a total failure and also be your total failure with you.
You: 'He called me a loser.' Best friend: 'I’ll call him a winner.'
You: 'I failed my life.' Best friend: 'I failed mine too. Let’s fail together.'
You: 'I’m a failure.' Best friend: 'I’m a failure. But we’re the best failure.'