CatTorrent is a powerful, simple, and elegant client for downloading any torrent right to your Android's memory. The client doesn't include an integrated search engine, so to use it you have to download a torrent file or use a magnet link from your Internet browser.
In CatTorrent's settings you can activate or deactivate the option to download exclusively when you're connected to a WiFi network (this is super useful). You can also turn on a setting to download only when your device is plugged in, which can come in handy as well.
CatTorrent is an excellent app for downloading torrents on your Android. It's elegant, light, and powerful. On top of that, the interface is pretty intuitive, so it doesn't even take long to get used to it.