Depending on the setting Summoning can be a very personal thing and Core SWADE doesn't (and really shouldn't) provide you with the options to tailor your summons. Trappings of course are always an option, but they still have a certain mechanical threshold they can't go beyond.

Summoner's Circle solves that handily and really breaks down how and why everything is priced the way it is. A lot of thought went into the summons fitting Savage Worlds.

For people who want such a high level of customization this is perfect. Just make sure you build your companion and discuss what it can do with your Storyteller ahead of time.