Since MCL Valluvan is not widely distributed as freeware anymore, here are excellent Tamil Unicode fonts that offer a similar aesthetic:
Downloading and Installing the MCL Valluvan Tamil Font: A Complete Guide
First, let's identify the font at the center of your search. The "MCL Valluvan" font is one of several Tamil fonts named after , the celebrated Tamil poet and philosopher best known for his work, the Thirukkural . These fonts are commonly used in various software applications for Tamil typing and design, especially in legacy systems that use ANSI (non-Unicode) encoding.