[RPG] Is this flightless homebrew “riding bird” familiar balanced

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A player in the new campaign I am DMing wants their character, a halfling wizard, to ride around on a small bird, going for a Sir Didymus from Labyrinth feel. He suggested this could be his familiar, though he was very clear he doesn't expect this give him any special advantages (increased speed, flight etc.) beyond those a familiar normally grants. I liked the idea, so I came up with the following creature which would be added to the list of animal forms for the find familiar spell:

Bococho (riding familiar)
Small fey, unaligned
AC 12
HP 3 (1d6)
Speed 25 ft. (cannot fly)
STR 7 (-2) DEX 15 (+2) CON 10 (+0)
INT 2 (-4) WIS 14 (+2) CHA 7 (-2)
Skills: Perception +4
Senses: Passive Perception 14
Magical Mount. A bococho can carry its master (including their belongings), as long as they are of size Small or smaller. It won’t carry anything else.
Actions:
Peck. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 4 (1d4 + 2) piercing damage.

It's based on the eagle's stats (since that's a Small-sized bird which is still CR 0), but with no flying speed (it's flightless), a better walking speed (matching a halfling's normal speed), no Keen Sight trait, and the new Magical Mount trait allowing it to carry its master and for simplicity's sake to magically ignore how much gear they're carrying. (For reference, the slightly increased Strength of 7 means it can carry up to 105 pounds, which seems pretty reasonable for carrying a halfling wizard, who will only weigh around 40 pounds plus gear.) It retains the eagle's hit points and (slightly tweaked for theme) attack.

Is this balanced? I'm pretty sure that the hp and attack won't be an issue, since it still has a tiny number of hp and it can't attack in normal circumstances anyway, but have I made it too weak removing it's ability to fly at all (rather than just specifying it cannot fly while being ridden, say) and removing it's sharp sight feature (advantage on Wisdom (Perception) checks involving sight)? Are there any drawbacks or advantages to this familiar that I haven't considered?

Best Answer

It breaks some rules, but should be fine

You are breaking some things that D&D tries to enforce:

  • A creature can only ride on a creature at least 1 size category larger than itself. A small creature riding another small creature breaks this idea, and leads for a more mobile mounted combatant.
  • The only way to get a magical mount is higher level spells. You're giving something that wizards and paladins get at higher levels at first level.
  • Not sure if it's intended, but your mount sounds like it can carry any weight as long as the master is carrying the loot. How gamebreaking this is depends entirely on how strict you are on the weight of loot in the first place.

However, while your familiar breaks those "rules", it looks fairly harmless. A familiar can't attack, so Peck is entirely irrelevant. Its high perception might cause some problems, but that is something other familiars can do as well, and its inability to fly makes it less viable for scouting.

The only real problem I see is that your wizard would be able to have the mount dash to double his normal movement speed every turn. How gamebreaking this ends up being depends a lot on how often you simply sneeze on the bird in round one to kill it.

For people who claim that this isn't really a problem because you can compare it to a 8 GP mule, there are a few key differences:

  • You can't stash a mule in hammerspace.
  • You can't buy a replacement mule in advance for when your current one dies halfway through the adventure, you can buy extra compoments to resummon your familiar.

How important those two points are depends entirely on how your campaign. For some campaigns this would make no difference at all, for others where mounts die constantly, this could be a huge boon.