Need.
I was bored enough to hastily translate the butler page (the maid page is similar) on the website and oh man, I want the saucy!personality butler so bad nnnnggggg. I guess if you want Hayate, it'd be the cheerful disposition though hm.
From here.
“Did you call for me, Master?â€
The Character Partner ‘Butler’ will support and take care of every one of your daily needs.
Character Partners will not only take part in battle with you, they will also talk with you, help you when you’re gathering materials, and even cook for your sake. The more you communicate with one another, at times, they may even carry out your requests.
Furthermore, if you also purchase the exclusive items, ‘Horse Carriage’ or ‘Magical Broom’, you can ride on them and they will surely take you anywhere you wish to go.
You can freely customize the face and hair of any Butler.
Also, you can set their personalities to either ‘Cool’, ‘Cheerful’, or ‘Saucy’*. According to their personalities, the Butler’s movements and lines will greatly differ, so please take care when choosing them. Again, the more you communicate with them, their intimacy level with you will change as well.
Staying by your side, together with you at all times, that is the Partner Character.
Even if you purchase the same Character Partner card, their clothing colors are set to change. Thus, the actual Character Partner may not look the same as the Sample Image.
*1st personality type is literally just ‘cool’. 2nd is akarui, which is cheerful, a bright disposition. 3rd is ‘namaiki’, which is impertinent, arrogant, saucy/cheeky, so close to tsun likely.
**For maids, the personality types are ‘ojou-sama’, basically the rich haughty tsun-type, ‘yasashii’, the kind and perhaps even Yamato Nadeshiko dere-type, and ‘tennen’, which is a sort of air-headed cloud cuckoolander-type.