My mentor/guider at my last internship.

He was great at guiding, only 1-2 years older than me, brought criticism in a constructive way (only had a very tiny thing once in half a year though) and although they were forced to use windows in a few production environments, when it came to handling very sensitive data and they asked me for an opinion before him and I answered that closed source software wasn't a good idea and they'd all go against me, this guy quit his nice-guy mode and went straight to dead-serious backing me up.
I remember a specific occurrence:
Programmers in room (under him technically): so linuxxx, why not just use windows servers for this data storage?
Me: because it's closed source, you know why I'd say that that's bad for handling sensitive data
Programmers: oh come on not that again...
Me: no but really look at it from my si.....
Programmers: no stop it. You're only an intern, don't act like you know a lot about thi....
Mentor: no you shut the fuck up. We. Are. Not. Using. Proprietary. Bullshit. For. Storing. Sensitive. Data.
Linuxxx seems to know a lot more about security and privacy than you guys so you fucking listen to what he has to say.
Windows is out of the fucking question here, am I clear?

Yeah that felt awesome.

Also that time when a mysql db in prod went bad and they didn't really know what to do. Didn't have much experience but knew how to run a repair.
He called me in and asked me to have a look.
Me: *fixed it in a few minutes* so how many visitors does this thing get, few hundred a day?
Him: few million.
Me: 😵 I'm only an intern! Why did you let me access this?!
Him: because you're the one with the most Linux knowledge here and I trust you to fix it or give a shout when you simply can't.

Lastly he asked me to help out with iptables rules. I wasn't of much help but it was fun to sit there debugging iptables shit with two seniors 😊

He always gave good feedback, knew my qualities and put them to good use and kept my motivation high.

Awesome guy!