Pillzman's Fox: The Blutsauger, which literally translate into Blood suckers from German, is a side grade leaning more to underpowered side of medic's primaries. For each syringe hit you heal for 3 hp, which is not much, untill you take in consideration that the syringe gun shoots 10 syringes a second for a total of 30 health per second (if all hits) However the downsides are you have reduced auto heal. The autoheal is lowered by 2 a second. so if you just took damage you will heal at +1 a second rather than +3, after sometime it increases to +4, rather than +6. A last hidden aspect is that with damage numbers on it shows +3 when you hit an enemy, however it will not show if you hit a disguise spy, but you will still heal.
Tor Tor: Fun fact: Did you know that in the past that set bonuses existed? If you wear a certain combo for example if you use the shortstop,mad milk, the fish and milkman in the past you will have 25 more health. It does not stop there, the set bonuses range from +25hp to being able to survive a headshot with 1 HP (yeah it existed). [To save space, i won't put them in]
Waifu_Whaler: How to kick yourself: In console, type 'status' (no quotes). This will bring up a list of players and the last ~20 bots from the previous round. Note the 3 (or 2) digit number next to your name. In console, type 'callvote kick #' (# being that number), and you can kick yourself. [Why Tho?]
Khaltek: The Widowmaker does 10% more damage to enemies targeted by your sentry gun, even if the sentry is out of ammo and can no longer fire.
Overlord: There are seven hats in TF2 which give you a copy in your Portal 2 inventory, for use in co-op: the mann co. cap, prince tavish's crown, pyro's beanie, fancy fedora, master's yellow belt, tyrant's helm, and aperture labs hard hat. However, if they dissapear from your TF2 inventory, they also dissapear from your Portal 2 inventory.
DeadlyBamy: Something additional for Etro's fact, You could just disguise as one of your teammate till you get behind them then do your moves, to disguise as one of your teammate, Pull out your disguise kit then press R and choose
RELIN-Q: Using the command mat_phong 0 makes everything less shiny and makes every Aus. Gold weapon full, solid gold. (And increases FPS!)

My plans to put their profile pictures in failed