A High-tech Valentine's Day Gift As Unique as Your Love is 

Your friend is a geek as he/she loves building things.  It'd be so satisfying for them to bring robot pets to life by assembling with lego-like parts and remote-control them with a mobile app and customized commands.

 

Your friend can even paint different colors, attach new 3D-printed parts to give his/her robot pets a new look or voice-control with his/her voice commands.

With optional camera and sensor modules, programmers can implement robotics applications such as navigation and pathfinding with cost-effective sensors and artificial intelligence algorithms, enable interaction with humans or pets through gesture, voice or vision recognitions