Being half Vampire makes being in unobstructed sunlight rather uncomfortable. Cannot use any traits you get from your Vampiric side in sunlight

+2 STR, +2 DEX (not affected by Solar Sensitivity)

Once per short/long rest, you may morph into a vampire bat for minutes/turns equal to your level. While in this state, you can fly and use Echolocation. If you go into sunlight while in this form you will instantly morph back into your normal state. You can only use your bite attack when you are a bat. You can also talk to other bats, you cannot speak common.

As half Vampire and half normal race, you can eat normal foods or suck blood to get nutrients. Some Dhampirs who go very long stretches of time without sucking blood start to irresistibly crave it, and those who never eat any normal food may get sick of blood.

As a Dhampir you can suck the blood of a creature within 5 ft (if they have any blood at all). In battle, it takes 3 actions total to completely drain the target of blood. Out of battle it takes 3 minutes. Upon a hit, the target is paralyzed for as long as you are sucking their blood and they take 1d4 + 1 piercing damage. The amount of turns/minutes it takes to drain a target may vary for larger and smaller races, this is up to the DM. Attacks made on you while you are using this attack have advantage. The effects of this attack vary for how long a target has been losing blood. After 1 action/minute they will feel dizzy and lightheaded, but can be healed through normal means. After 2 actions/minutes they have lost so much blood they can only be saved through magical healing. After 3 turns, they are completely drained of blood and will live for only seconds before dying. During these last seconds of consciousness, a very powerful healing spell can save them 

You can speak with undead creatures that know/knew Common or any other language  you know and you have Resistance to Necrotic damage.