Can you tame a mimic? 

My players managed to save a baby mimic and it bonded with one of the party - I'm saying it is now a full grown mimic (still has telepathy) and a player asked me if it could polymorph as an arm and replace the lost limb of the PC.  What kind of mechanics would be fair for the PC?

in my current campaign, I tamed a mimic and it was so cool I made it a cape and called it rip off doctor strange

true polymorphing things into mimics of various sizes in the BBEGs fortress sounds like fun. }:)

yes, look at the tons of posts saying they did tame a mimic

A druid but instead of wooden tools you are wood

Quote from Eravanfeighn >>

DM: a single skeleton enters the hallway, walking towards you with an uneven gait.

PLAYER AT LEVEL 20: one skeleton? We’re level 20! Stop giving us level 1 threats!

DM: actually, as it nears you, you see that each bone has two eyes and a mouth, and you discover that every bone in the skeleton’s body is a mimic. Now, please roll initiative against 206 mimics!

PLAYER: RUN!!!

 Level 20 Wizard: "FIRE BALL!!" (at max level). Problem solved. Phew.

setting up an arcade where the game and machines end up being mimics

This is breaking all the laws of physics

I'm gonna spam so many mimics all over my world that my players are gonna be so paranoid LOL! I'm a horrible person lol.

Would it be possible for a mimic to be an item of armor or a weapon at all? That players could use until it’s later revealed to be a mimic?

Quote from icelandicarmor >>

Would it be possible for a mimic to be an item of armor or a weapon at all? That players could use until it’s later revealed to be a mimic?

 I would think so, I guess it's really just the dm's choice on what it looks like.

Found a set of locked mimics and fed and tamed them. They had babies and in this world i was using guns. Now I have mimic bullets that stay inside unless I roll a nat 20 to hit, attacking every round afterword, and on the round they hit it. So however much damage the gun does, plus 2d8+3. And you have to make a grapple check with a dc of 17 to get it out of you, because they are inside you so its harder to get to them.

😲

Quote from Subscion >>

I came across a mimic and have decided to teach it to be used as a trick die or trick card. To be able to change in a moment to a different number or card... Undetectable as magic since it's a trait of the creature to polymorph.

Have yet to try in-game yet but it seems like it will work great 😏

 Wow that is smart

How would you tame one of these?

Hey* do you have any ideas i can use?                         *not horse 🐴food

I put one in my game disguised as a "helm of Invisibility" that sadly claimed the life of a Rogue whose player thought stealing from his comrades and sneaking ahead to loot the dungeon while they were resting was "What his Character Would do" despite knowing full well that he was screwing over the rest of the players who worked just as hard as he did to clear a dungeon. (this was not his first offense, his behavior was discussed both in character and out.)

Sadly the door to the treasure vault, which he had closed behind him upon entering, muffled his shouts for help and the party "Slept Through" his final moments. They found him the next morning minus two thirds of his head. (I asked the players if they would like to make a perception roll at disadvantage to hear his cries for help and awake. One of them asked if he could intentionally fail the roll. They all chose to do so.) Truly a sad tale. 

Dragon Magazine #75, Page 6 (1983). Ecology of the Mimic, Ed Greenwood.
Free to read online
For those that want to know beyond just the stats

Quote from HailRobonia >>

Mimic: "This isn't even my final form!" *polymorphs into a coat rack* bwahahahaa!

 ha haha