Would Rick also tf into something to combat his rival?

In an alternate world, yes, he would.
Wait, how do you know his name is Rick?

I browsed some of your artwork here and on da(since I also have an account there lol) and I found out about his name. What do you think he would tf into? I imagine he would tf into some other kaiju as well, although I imagine that they would abandon their rivalry some time after, due to them being big monsters, and maybe become friends or something more than that.. lol

This is heart-touching for me~ My main OC has finally reached recognition across more than one website, yay!! 8D

To answer your question, he would tf into either the MonsterVerse version of Godzilla or a dragon-like kaiju in this case.
In another story concept, both he and Blaine (his rival) have dragon powers. During the day, Rick is a police detective, while Blaine is the CEO of a multibillion-dollar corporation and the mayor's son.
At night, however, the two are actually weredragons, humans sharing their body, mind, and soul with a dragon entity. Rick is a feral vigilante, patrolling the streets and helping to turn the tide in crime-ridden Bradford City, naming himself and his dragon companion Arson. Blaine's companion is a much more destructive dragon named Dante. Blaine uses his draconic abilities to wreak havoc across Bradford City in ways that'll benefit him and his company. These two frequently run into each other, aware of one another's powers and reptilian companions. But no matter how often they fight and wound one another, they could never fatally harm each other, as they're both equally matched in term of strength, vigor, and endurance...
I may have envisioned that these two have a love/hate relationship, to the point where they're not exactly friends but rather enemies with benefits~

Ah interesting! I think I can see what you have in mind. Oh, and what kinds of tfs do you like? And do you allow your ocs to be draw in other tfs?

I like mostly feral and anthro TFs, along with some unusual TFs I discovered recently.
And yes, I do allow my OCs to be drawn in other TFs

Can I sent you a dm of an unusual idea I have for one that I want to draw? :P

Sure, by all means, go for it!