Okay I'm new to the table top scene and this app as well and I'm not sure if this is the right place for this but here it goes. First question is a high elf aasimar possible to create? And if so what if I switched in game like an awakening. My class is a paladin. My dm is relatively new too so I wanted to get the facts before I run it by him. I can spin the background to fit I think. I also don't want to make it harder on my dm or fellow players. Thank you guys in advance. Really enjoy the game especially the butt kicking for goodness!

Aasimar appear human, so technically, no. But story-wise, anything's possible. There aren't a lot of mechanical differences, so switching the race of your character isn't a huge deal. There are other mechanics that can change a player's race as well. It would be a little bit like starting a new character. Definitely talk it over with the DM, and have a plan in case it doesn't work out -- like it was a vision from your deity or something, or a temporary blessing, so you can roll it back if it doesn't work out for whatever reason.

The facts are you have to run it by your DM. ;-) 

I don’t know what you mean by high elf variant aasimar; there are options you can consider, but nothing officially published already. You can go with high elf stats and reflavour as an aasimar or vice versa, you can cook something up using Custom Lineage, or you can homebrew something entirely new. Regardless though, your DM will have to sign off on it (strictly speaking that applies to anything and everything anyway).

Yeah, to "awaken" into what's de facto a different race, possibly with different traits or changes to proficiencies etc., that's not something a player just "does."  It has to be done in consultation with a DM, a new DM would probably be uncomfortable with it, so if they do go along with it, the safest option would probably just to swap out high elf for aasimar.  I mean D&D Beyond would keep things stable if you went for customize my origin and modified the Aasimar from there to be more elf like, but I wouldn't homebrew anything until you and the DM get more game time in.  

Do you mean something with the stats of one, but looks like the other? Or some kind of combination of the two together mechanically?

The 2 together I heard Aasimar are usually born human but there are half races in Pulmara. I was curious if you could use them or is that just in Pulmara

If you guys are just starting out, I recommend sticking with the simple stuff first and play with just the stuff in the Basic Rules/Standard Reference Document. Personally, I would even recommend avoiding character creation until your second campaign. Based on my experience, character creation can take a really long time due to players experiencing analysis paralysis trying to absorb all the new information and then making decisions off of what they just learned. If you guys do want to include character creation for your first campaign, be prepared to have extended, or even multiple, session zeroes. I needed three session zeroes before my group even wacked their first goblin as character creation took a long time.

Once you have a few sessions under your belt, then feel free to explore homebrew. Currently, there are no solid mechanics in place to support characters of mixed ancestry, and mixed race characters are mostly just fluff and lore. Half elves and half orcs (their other halves being human) exist, but they basically function as their own race and are distinct from their parent races. Your best low-effort work around right now is to create an aasimar character and give it elven racial feats to reflect that mixed heritage mechanically. If every race had their own racial feats associated with them, then incorporating mixed ancestry mechanically into your character is not a big issue. However, without homebrew, this approach only works for a few races, namely elves, dwarves, gnomes, halflings, orcs, tieflings, dragonborn, and humans. Anything even slightly more fancy like goblin-ogre is not going to work with this approach since there are no official racial feats for goblins and ogres. Homebrew changes everything though.

If you and your GM do not mind homebrew (while homebrewing with pen and paper is not that much work, but homebrewing on Beyond can be if it involves a lot of math), I believe using the feat system is the best way to go about it, since you can add as many feats as you want to reflect the complexity of your character's ancestry. For example, instead of using the aasimar race as the base with elven feats on top, you may want to have the elf race as the base instead since your character may identify more with their elven side, or simply because you like the elven racial mechanics better. In this case, I would turn each of the aasimar's unique abilities into feats (Celestial Resistance, Healing Hands, Light Bearer), and then tack them onto the high elf character as your character gain more power and be more intune with their aasimar heritage. Additionally, if you feel some unique abilities are too weak or boring on their own as feats, you can just combine some of them together. Using the same aasimar example, if you feel Celestial Resistance and Light Bearer are lackluster on their own, you can just combine them into one feat and call it Celestial Bearer or something.

Thank you. I've played Baulders Gate 1 an 2 as well as both Icewind Dales and several others with the same mechanics. I'm sure I could do the math but I think you are right and I should stay in the shallow end for now. Table top is still new to me and the GM. We have a seasoned player playing with us but I'm just going to keep it simple until I get more experience. Thank you for taking the time to help me. 

 Thank all of you and I'm just going to get more acclimated to the game first. I'm just really excited to have found fellow nerds near me that are into stuff like this. Thank you for taking the time to give me advice and may the dice be forever in your favor

I understand. Trying to get in over my head. I'm just excited about the game. Thank you for your advice

Quote from MidnightPlat >>

Yeah, to "awaken" into what's de facto a different race, possibly with different traits or changes to proficiencies etc., that's not something a player just "does."  It has to be done in consultation with a DM, a new DM would probably be uncomfortable with it, so if they do go along with it, the safest option would probably just to swap out high elf for aasimar.  I mean D&D Beyond would keep things stable if you went for customize my origin and modified the Aasimar from there to be more elf like, but I wouldn't homebrew anything until you and the DM get more game time in.  

 I mean, there is *reincarnate*. So characters do occasionally change race in game and lore. Unfortunately, "The reincarnated creature recalls its former life and experiences. It retains the capabilities it had in its original form, except it exchanges its original race for the new one and changes its racial traits accordingly." So you'll have to pick anyway.