How customizable are the AI companions you can create? Just how real can they feel?

I've been diving deep into creating an AI companion lately and have been blown away by the level of control some platforms now offer. You can design not just looks (down to facial features and style) but also craft a full personality—from a sweet and caring type to a bold and adventurous one. The ones that truly stand out remember your conversations and adapt to you, making chats feel surprisingly real and coherent over time. If you're curious about trying this level of customization, I've been using MyLovely AI. It offers a really intuitive way to build a companion and bring them to life with images and videos, all in a secure space. Has anyone else had a similarly in-depth experience elsewhere, or is this the new standard?