While DHIL is a powerful character, given you have Dr.Ratio for free, pulling for DHIL is ill-adviced unless you really like him and you don’t like Dr.Ratio as much. They share many similarities aside from being Imaginary-type DPS. They are just at the same power level, they both need exquisite team-building, and they are both good for MoC but not so good for PF.

If you like DHIL and want him anyway, his best companions should be Ting Yun and Pela, who are free-to-play DPS assistants that are SP positive that allows him to spam his dragon pulse very often. Sparkle is a good companion as well and she is coming just after DHIL’s rerun.

If you plan to play Dr.Ratio instead, his best companions should be Ting Yun and Pela, the former grants him with extra energy to allow him to use his ult more often and the latter guarantees the enemy to have the debuffs that Dr.Ratio is asking for. If you have more budgets. Sparkle is a good companion as well and she is coming just after DHIL’s rerun.

It’s a game, so play in any manner you can enjoy. Most characters are rewarding if well-built.