It is now my mission to find and tame one of these majestic creatures.

Could be your familiar

I know.

Only with the Warlock pact of the Chain feature.

Your DM could let you get one which naturally appears, but yeah that's the main way of getting one

Would it be possible to play one of these in a campaign? IDKY but it sounds like it could be fun to play as one of these little guys. I just don't know where to start in making it possible. Something It probably should be awoken though, trying to translate basic feelings into a full campaign is such a pain.

I have one as my beast companion and I love it.  I do not really use him for combat at all but scouting and problem solving makes having one around really fun.  

Quote from Thioldgamer >>

Could be your familiar

 Yes in the monster manual there is a rule to get this as a familiar.

Page 254 of the MM, green text box Variant rule for the Psuedodragon as a familiar.

 This needs to have its variant rule green text added in to its entry. I didn't even know it existed until someone pointed it out in the physical MM and sure enough, there is variance between the physical MM and this entry.

The familiar text is available on DnD Beyond if you go directly to the monster manual source entry. It can be found here: https://www.dndbeyond.com/sources/mm/monsters-p#Pseudodragon

No if your kind to one you can make it a familiar like friend, which when within 5 feet grants it's magic resistance

 Does a Pact of the Chain warlock benefit from the Familiar Variant Pseudodragon and it's abilities?

Quote from Zelmegas >>

 Does a Pact of the Chain warlock benefit from the Familiar Variant Pseudodragon and it's abilities?

 nope the Pact of the Chain creature, like the regular find familiar one, is a spirit that assumes the form of such a creature rather than the actual creature itself. The benifits you get from the Pact of the Chain are as follows.

• Can see through familiars eyes and hear through their ears, deafning ones own senses doing so meaning you have to use the familiars stats for perception.
• Deliver Touch spells within 100 ft
• Safely dismiss your familiar on a temporary or permanent basis and resummon it as an action
• Change the creature by completing the ritual again
• Completely loyal to you and follows commands
• Can't truly die and is dirt cheap to revive, variant familiar death is permenant
• Can attack giving up one of your own. Variant can attack completely independently as its a full creature

And other features granted by invocations you might choose to pick up

I wish they had the camouflage feature of the original AD&D version - as a DM I would give them this power... advantage on stealth checks perhaps.

Quote from bcwrath >>

Would it be possible to play one of these in a campaign? IDKY but it sounds like it could be fun to play as one of these little guys. I just don't know where to start in making it possible. Something It probably should be awoken though, trying to translate basic feelings into a full campaign is such a pain.

 It can’t be awoken, it’s too smart and it not a Beast... it could travel with the party because the party are friends with it...

Quote from Mdaddy >>

Quote from Zelmegas >>

 Does a Pact of the Chain warlock benefit from the Familiar Variant Pseudodragon and it's abilities?

 nope the Pact of the Chain creature, like the regular find familiar one, is a spirit that assumes the form of such a creature rather than the actual creature itself. The benifits you get from the Pact of the Chain are as follows.

• Can see through familiars eyes and hear through their ears, deafning ones own senses doing so meaning you have to use the familiars stats for perception.
• Deliver Touch spells within 100 ft
• Safely dismiss your familiar on a temporary or permanent basis and resummon it as an action
• Change the creature by completing the ritual again
• Completely loyal to you and follows commands
• Can't truly die and is dirt cheap to revive, variant familiar death is permenant
• Can attack giving up one of your own. Variant can attack completely independently as its a full creature

And other features granted by invocations you might choose to pick up

 Quick question, does the Pseudodragons’ venom carry over into the Chain version? I have a build in mind and, if this was the case, it’d be even stronger!

As a neutral good mountain dwarf, I NEED THIS.

1) be a bard; 2) get Find Familiar, Find Steed, Create Homunculus, and True Polymorph from Magical Secrets; 3) create a cool-looking Homunculus; 4) use True Polymorph to turn my Familiar into a Tressym and my Steed into a Pseudodragon; 5) profit.

same

I believe the intentions of the variant familiars are meant to work with Pact of the Chain and with the Find Familiar spell as well. I would personally allow it.