Sorry, but I think "find familiar" on a ranger makes no sense.
I have not played a 5E game before, but judging from the previous games:
Familiars are small pets of casters ( mostly wizards, in pathfinder also witches) that give their owner minor bonusses, help them with spells or do stuff for them like scouting or delivering messages. They are not well suited for fighting.
In a video you saw Swen summoning a little spider that was killed when attacking Shadowheart. Thats it.
Rangers should have an animal companion.
I do not know much about 5E, but it would be cool if a ranger could charm an animal to become his companion instead of using a summon spell.
This could cause you trouble if the animal already has an owner or it is part of a group of animals.
Imagine you start as a lone ranger. Then you meet somebody riding on a horse. You charm the horse, the owner gets angry but you and the horse kill him together.
To avoid some cheese, charming might take some time and require concentration and you have disadvantage when trying this during combat.
Beside coolness it would be fair logical to implement some form of real living animal companion for nature oriented character classes. The spirit or ghost forms of creatures ist some thing for shamans and druids anyway. If larian does not want to risk the contra argument of the core community that character classes have to be different and with weaknesses too there could be no magic caster, nature fighter and druid classes with all the same form of compagnions for activating levers and so on. As it is discussed in the companion topic parallel there should be a clear path for ranger class talents orientated on core values of dungeons & dragons: the picture of a wilderness loving hunter with pro and anti animals, path finding and nature skills. There could be more roleplay with more differences in character classes.
